CN106605434A - D2D data transmission-timing advance for idle mode UE - Google Patents
D2D data transmission-timing advance for idle mode UE Download PDFInfo
- Publication number
- CN106605434A CN106605434A CN201580046866.9A CN201580046866A CN106605434A CN 106605434 A CN106605434 A CN 106605434A CN 201580046866 A CN201580046866 A CN 201580046866A CN 106605434 A CN106605434 A CN 106605434A
- Authority
- CN
- China
- Prior art keywords
- direct link
- timing
- information
- terminal
- timing information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 147
- 238000004891 communication Methods 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 74
- 230000004913 activation Effects 0.000 claims description 31
- 108091006146 Channels Proteins 0.000 description 95
- 230000008569 process Effects 0.000 description 37
- 230000011664 signaling Effects 0.000 description 26
- 238000001994 activation Methods 0.000 description 25
- 230000006870 function Effects 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 16
- 238000009826 distribution Methods 0.000 description 12
- 238000001228 spectrum Methods 0.000 description 12
- 230000002776 aggregation Effects 0.000 description 11
- 238000004220 aggregation Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 10
- 230000001360 synchronised effect Effects 0.000 description 10
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- 238000010295 mobile communication Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000006399 behavior Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000007726 management method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000000969 carrier Substances 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 108010028984 3-isopropylmalate dehydratase Proteins 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002085 persistent effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000036301 sexual development Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 101000741965 Homo sapiens Inactive tyrosine-protein kinase PRAG1 Proteins 0.000 description 1
- 102100038659 Inactive tyrosine-protein kinase PRAG1 Human genes 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004186 co-expression Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000004549 pulsed laser deposition Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0025—Synchronization between nodes synchronizing potentially movable access points
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a transmitting terminal for transmitting data to a receiving terminal over a direct link connection. The transmitting terminal comprises a receiving unit that receives from at least one neighboring terminal direct link timing information generated at the respective neighboring UE for determining the timing of the data transmission over the direct link. A generating unit generates derived direct link timing information based on the received direct link timing and which can be used for generating a derived direct link transmission timing value for determining the timing of the data transmission over the direct link. A transmitting unit transmits to the receiving terminal the derived direct link timing information.
Description
Technical field
The present invention relates to a kind of device for determining the transmission timing of the direct link data is activation in D2D communication systems
And method.Specifically, the invention further relates to one kind can be operated in device-to-device communication system and be able to carry out this
The user equipment of bright method.
Background technology
Long Term Evolution (LTE)
Third generation mobile system (3G) based on WCDMA radio access technologies is just in whole world widespread deployment.Strengthen or
The first step of evolution this technology needs to introduce high-speed downlink packet and accesses (HSDPA) and enhanced up-link (also referred to as
High Speed Uplink Packet accesses (HSUPA)), this causes radio access technologies to have very high competitiveness.
In order to the user's needs to further increasing are ready and in order which is wirelessly electrically accessed skill relative to new
Art has competitiveness, and 3GPP introduces the new mobile communication system of referred to as Long Term Evolution (LTE).LTE is designed to meet lower ten
The carrier wave of the high-speed data and media transmission in year needs and Large Copacity voice is supported.The ability for providing high bit rate is LTE
Key measure.
Referred to as UMTS terrestrial radios access (UTRA) and UMTS Terrestrial Radio Access Networks (UTRAN) of evolution is long-term
Work item (WI) specification of evolution (LTE) is ultimately determined to version 8 (LTE versions 8).LTE system represents efficient based on packet
Be wirelessly electrically accessed and radio access network, its provide with low latency and low cost the function based on full IP.Give in [3]
Go out detailed system requirements.In LTE, specification such as 1.4,3.0,5.0,10.0,15.0 and 20.0MHz it is adjustable many
Individual transmission bandwidth, to use given frequency spectrum to obtain flexible system deployment.In the downlink, using based on orthogonal frequency division multiplexing
With being wirelessly electrically accessed for (OFDM), this is because its intrinsic capacity of resisting disturbance to multi-path jamming (MPI), and this capacity of resisting disturbance
It is due to obtained from low chip rate, the use of Cyclic Prefix (CP) and its association for arranging from different transmission bandwidths.
Using being wirelessly electrically accessed based on single-carrier frequency division multiple access (SC-FDMA) in up-link, this is because, it is contemplated that user equipment
(UE) limited transmit power, there is provided wide area is covered and has precedence over raising peak data rate.Employ how defeated including multi input
Go out (MIMO) channel transmission technology in interior many crucial packet radio access technologies, and realize in LTE versions 8
Efficient control signaling structure.
LTE and E-UTRAN frameworks
Overall architecture is shown in Fig. 1, the more detailed expression of E-UTRAN frameworks in Fig. 2, is given.
As shown in Figure 1, LTE frameworks support the such as UTRAN that EPC is connected to via Serving GPRS Support Node (SGSN)
Or the interconnection of the different radio access network (RAN) of GERAN (GSM EDGE radio access networks).In 3GPP mobile networks,
Mobile terminal 1 10 (referred to as user equipment, UE or equipment) is via the node B (NB) in UTRAN and via in E-UTRAN accesses
Evolution node B (eNB) and be attached to access network.NB and 120 entities of eNB are referred to as base station in other mobile networks.Have
Two data packet gateways in EPS, for supporting UE mobilitys-service grid environment (SGW) 130 and packet data network
Gateway 160 (PGW of PDN-GW or abbreviation).Assume that E-UTRAN is accessed, eNB entities 120 can be by Wireline via S1-U
Interface (" U " represents (stay for) " user plane ") is connected to one or more SGW and is connected to via S1-MMME interfaces
Mobility Management Entity 140 (MME).SGSN 150 and MME 140 is also referred to as service core network (CN) node.
As described in Fig. 2, E-UTRAN includes the node B (eNB) 120 of evolution, and its E-UTRA provided towards UE is used
Family plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol termination (termination).ENB 120 is responsible for
(host) physics (PHY), medium access control (MAC), radio link control (RLC) and packet data control agreement (PDCP)
Layer, these layers include the feature of user plane header-compressed and encryption.ENB 120 is also provided corresponding to the wireless of control plane
Electric resources control (RRC) feature.ENB 120 performs many functions, including provided for radio resources management, allowance are controlled, dispatched, applying
Plus encryption/decryption, and the DL/UL user planes of negotiated UL QoS, cell information broadcast, user and control plane data
The compression/de-compression of packet header.
It is eNB is interconnected amongst one another by X2 interface.ENB is also connected to EPC (packet core of evolution) by S1 interfaces, more specifically
Ground, is connected to MME (Mobility Management Entity) by S1-MME and is connected to gateway (S-GW) by S1-U.S1 interfaces
Hold the many-to-many relationship between MME/ gateways and eNB.SGW is route to user data packets and is forwarded, while also work
During as the transfer between eNB for user plane mobility anchor point and work be for LTE and other 3GPP technologies it
Between ambulant anchor point (termination S4 interfaces simultaneously relay the business between 2G/3G systems and PDN GW).For idle condition
UE, SGW terminate (terminate) DL data paths and trigger paging when the DL data for UE are reached.SGW is managed and is deposited
Storage UE contexts (context), for example, the parameter of IP carrying services, network internal routing iinformation.In the situation of lawful intercept
Under, SGW also performs the duplication to customer service.
MME 140 is the key control node for LTE access networks.MME 140 is responsible for idle pulley UE and follows the trail of and seek
Exhale process, including repeating transmission.MME 140 participates in bearing activation/disabling process, and is also responsible in initial attachment and is being related to
SGW is selected for UE when transferring in the LTE of core network (CN) node reorientation.MME 140 is responsible for the certification (by interacting with HSS)
User.Non-Access Stratum (NAS) signaling terminates at MME, and MME 140 is also responsible for generating UE and assigns temporary mark.MME
140 check the mandate for being resident (camp) to UE on the public land mobile network (PLMN) of service provider, and it is unrestrained to apply UE
Trip is limited.MME is the end points of the encryption/integrity protection in network for NAS signaling, and processes security key management.MME is also
Support the lawful intercept of signaling.MME also utilizes from SGSN start and end the S3 interfaces for being connected on MME, there is provided access for LTE and 2G/3G
Ambulant control plane function between network.MME also terminates the S6a interfaces towards ownership HSS, for roaming UE.
Component carrier structure in LTE
The structure of the component carrier in Fig. 3 and Fig. 4 diagram LTE.In so-called subframe, 3GPP is segmented in time-frequency domain
The downlink component carrier of LTE system.In 3GPP LTE, each subframe is divided into into two descending chains as shown in Figure 3
Channel time slot, wherein first downlink time slots includes control channel area (PDCCH areas) in first OFDM symbol.Per height
Frame includes the OFDM symbol (being 12 or 14 OFDM symbols in 3GPP LTE (version 8)) of the given number in time domain, wherein
Whole bandwidth of each OFDM symbol across component carrier.Therefore, OFDM symbol is each included in accordinglyIndividual pair
The multiple modulated symbols sent on carrier wave, equally as shown in Figure 4.
Assume the multi-carrier communications systems (as example used in 3GPP Long Term Evolutions (LTE)) for example with OFDM,
The least unit of the resource that can be distributed by scheduling unit is one " Resource Block ".Physical Resource Block is defined as in time domainIn individual continuous OFDM symbol and frequency domainIndividual continuous subcarrier, as illustrated in fig. 4.In 3GPP LTE
In (version 8), Physical Resource Block is so as to includingIndividual Resource Unit, its correspond to a time slot in time domain and
180kHz in frequency domain (can be found in for example following document with regard to the further detail below of down-chain resource grid：3GPP
TS36.211, " Evolved universal terrestrial radio access (E-UTRA)；physical
Channels and modulations (Release 10) ", version 10.4.0,2012, the 6.2nd part, which can be
http://www.3gpp.org is freely obtained and is hereby incorporated).
Even if also do not made although some Resource Units that Resource Block is interior or Resource Block is internal may occur and being scheduled
With, but, it is simple and clear for the term that used, still distribute whole Resource Block or Resource Block pair.The actual unit that is not scheduled
The example of the Resource Unit of distribution includes reference signal, broadcast singal, synchronizing signal and is used for various control signals or channel
The Resource Unit of transmission.
The downlink transmission bandwidth that the number of the Physical Resource Block in downlink is configured in depending on cell, and mesh
It is front to be defined as in LTE from the interval (interval) of 6 to 110 (P) RB.Common practice in LTE is with Hz (examples
Such as 10MHz) bandwidth is represented for unit or in units of Resource Block, for example, for downlink scenario, bandwidth of cell can be with equivalent
Be expressed as such as 10MHz.
Channel resource can be defined as " Resource Block ", as shown in Fig. 3 exemplarily, in fig. 3, it is assumed that multicarrier is logical
Letter system, which is such as example discussed in the LTE work items of 3GPP for example with OFDM.More generally, it can be assumed that Resource Block
The least resource unit that can be distributed by scheduling unit in the air interface of specified mobile communication.Make according in mobile communication system
Access way, the dimension of Resource Block can be the time (for time division multiplex (TMD), for example, time slot, subframe, frame etc.),
Frequency (for frequency division multiplexing (FDM), for example, subband, carrier frequency etc.), code (for code division multiplexing (CDM), for example, extend
(spreading) code), antenna (for example, multiple-input and multiple-output (MIMO)) etc..
By virtual resource blocks to mapping the data on Physical Resource Block.A pair of virtual resource blocks are mapped to a pair of things
On reason Resource Block.The virtual resource blocks of following two types are according to reflecting on their Physical Resource Block in LTE downlinks
Penetrate and define：Localized virtual resource block (LVRB) and distributed virtual resource block (DVRB).In the concentration using centralized VRB
In formula sending mode, eNB is controlled completely to being had using which and how many Resource Block, and generally should be chosen using this control
Choosing causes the Resource Block of big spectrum efficiency.In most of mobile communication system, this causes for entering to unique user equipment
Contiguous physical Resource Block or multiple clusters of contiguous physical Resource Block that row sends, this is because radio channel is in a frequency domain
Relevant, so as to imply：If a Physical Resource Block provides big spectrum efficiency, then adjacent Physical Resource Block has very much
Similar big spectrum efficiency may be provided.In the distributed sending mode using virtual reality B, the number for same UE is carried
According to Physical Resource Block be distributed in frequency band, at least to hit some Physical Resource Block for the spectrum efficiency for providing fully big,
It is derived from frequency diversity.
In 3GPP LTE versions 8, downlink control signaling is substantially carried by following three physical channel：
Physical control format indicator channel (PCFICH), for indicating the OFDM symbol in subframe for control signaling
Number；
Physical Hybrid ARQ Indicator channel (PHICH), sends the downlink that associate with uplink data for carrying
ACK/NACK；And
Physical downlink control channel (PDCCH), for carrying downlink scheduling distribution and uplink scheduling point
Match somebody with somebody.
Using known predefined modulation and coded system, the known location from the control signaling area of downlink subframe is sent out
Send PCFICH.User equipment decodes PCFICH, to obtain the information of the size in the control signaling area in subframe, for example, OFDM
The number of code element.If user equipment (UE) can not decode PCFICH or if user equipment obtains the PCFICH values of mistake,
Then user equipment will can not correctly decode the L1/L2 control signalings (PDCCH) that control signaling area includes, this may cause to lose
All resource allocations that mistake is wherein included.
PDCCH carries control information, such as, for the scheduling for downlink or uplink data transmission assigned resources
License.According to the PCFICH in subframe, send for user equipment on first in one, two or three OFDM symbol
PDCCH.
Physical down link sharing channel (PDSCH) is for transmitting user data.PDSCH is mapped to a sub- frame in exist
Remaining OFDM symbol after PDCCH.The PDSCH resources assigned for UE are in units of the Resource Block for each subframe.
Physical uplink link shared channels (PUSCH) carry user data.Physical uplink control channel (PUCCH) is taken
With the signaling on uplink direction, such as, dispatch request, in response to the HARQ affirmation and negations of the packet on PDSCH
Confirm, and channel condition information (CSI).
Term " component carrier " refers to the combination of several Resource Block.In the version in LTE future, term " component carrier " is no
Used again；Alternatively, the term is changed to " cell ", which refers to the group of downlink and optional uplink resource
Close.The carrier frequency and uplink resource of down-chain resource are indicated in the system message sent on down-chain resource
Association between carrier frequency.
Further development (LTE-A) to LTE
The frequency for senior IMT (IMT-Advanced) is determined in World Radio Communications Conference 2007 (WRC-07)
Spectrum.Although determining the overall spectral for senior IMT, according to each area or country, actual available frequency bandwidth is not
Together.However, after usable spectrum summary is determined, third generation partner program (3GPP) has started the mark of radio interface
Standardization.In the 39th meetings of 3GPP TSGRAN, have approved with regard to " for further development (the LTE liters of E-UTRA in 3 gpp
Level version) " research item description.The research item is covered for example in order to meet the requirement of senior IMT and is wanted in the evolution of E-UTRA
The technology segment of consideration.Hereinafter describe currently for two major technique parts LTE-A under consideration.
It is used for supporting the carrier aggregation of broader bandwidth in LTE-A
The bandwidth that LTE upgrading edition systems can be supported is 100MHz, and LTE system can only support 20MHz.Now, nothing
Line electricity frequency spectrum lack become wireless network development bottleneck, accordingly, it is difficult to find to LTE upgrading edition system for it is sufficiently wide
Spectral band.Thus, urgent need finds the method for obtaining wider radio spectrum bands, and possible answer is carrier aggregation feature.
In carrier aggregation, two or more component carriers (CC) are aggregated to just support that up to 100MHz's is broader
Transmission bandwidth.Several cells in LTE system are polymerized to broader channel (channel pair in LTE upgrading edition systems
It is sufficiently wide for 100MHz), even if these cells in LTE are also such in different bands.UE can be according to its ability
Received on one or more CC simultaneously or sent：
- having can be corresponding to the more of multiple Serving cells for the reception of CA and/or the version 10UE of transmitting capacity
Received on individual CC simultaneously and/or sent；
- version 8/9UE only can be received on the single CC corresponding to a Serving cell and be sent on single CC.
For continuous and discontinuous CC supports carrier aggregation (CA), and use 8/9 numerology of version
(numerology) 110 Resource Block of maximum each CC being limited in frequency domain.
It is different number of from same eNodeB (base station) and may be in uplink to be polymerized that user equipment can be configured
Component carrier with different bandwidth in road and downlink.The number of configurable downlink component carrier is depending on UE's
Downlink aggregation ability.Conversely, up-link polymerization energy of the number of configurable uplink component carrier depending on UE
Power.Perhaps the mobile terminal with uplink component carriers more more than downlink component carrier can not possibly be configured.
In typical TDD deployment, the number of component carrier and each component carrier in uplink and downlink
Bandwidth it is identical.Identical coverage need not be provided from the component carrier of same eNodeB.
Component carrier will be compatible LTE versions 8/9.However, current mechanism (for example, forbidding (barring)) is available
Reside on component carrier in version 8/9UE is avoided.
Spacing between the mid frequency of the component carrier being continuously polymerized should be the multiple of 300kHz.This is in order to can
It is compatible with the 100kHz frequency rasters of 3GPP LTE (version 8/9), while keeping the orthogonal of the subcarrier with 15kHz spacing
Property.According to polymerization situation, can help realize n by a small amount of untapped subcarrier is inserted between continuous component carrier
× 300kHz spacing.
The property of the polymerization of multiple carrier waves is exposed only up to MAC layer.For up-link and both downlink, for
The component carrier of each polymerization, needs a HARQ entity in MAC.(in the situation of the SU-MIMO not existed for up-link
Under) transmission block is up to per component carrier.Transmission block and its potential HARQ are retransmitted and are needed to be mapped on same component carrier.
The 2nd layer of the carrier aggregation with activation for downlink and up-link is shown respectively in fig. 5 and fig.
Structure.Transmission channel is described between MAC and the 1st layer, the description logic channel between MAC and RLC.
When carrier aggregation (CA) is configured, UE is only connected with the RRC of network with one.RRC connection establishments/reconstruction/
During transfer, a Serving cell provides NAS mobility informations (for example, TAI), also, in RRC connection reconstructions/transfer, one
Serving cell provides safety and is input into.This cell is referred to as main plot (PCell).In the downlink, corresponding to the carrier wave of PCell it is
Down-link principal component carrier wave (DL PCC), and in the uplink, which is up-link principal component carrier wave (UL PCC).
According to UE abilities, secondary cell (SCell) is configurable to one group of Serving cell is formed together with PCell.Descending
In link, it is downlink auxiliary component carrier wave (DLSCC) corresponding to the carrier wave of SCell, and which is up in the uplink
Link auxiliary component carrier wave (UL SCC).
This group of Serving cell for UE for being configured is therefore always including a PCell and one or more SCell：
- for each SCell, except down-chain resource, uses of the UE to uplink resource be also it is configurable (because
The number of the DL SCC configured by this always greater than or can be configured to only make equal to the number of UL SCC, and no SCell
With uplink resource)；
- from the angle of UE, each uplink resource only belongs to a Serving cell；
Polymerizing power of the number of-configurable Serving cell depending on UE；
- PCell only can change with hand-over (that is, as safe key changes and RACH processes)；
- PCell is used for sending PUCCH；
- different from SCell, PCell can not be disabled；
- in PCell experience Rayleigh decay (RLF), rather than when SCell experiences RLF, triggering is rebuild；
- Non-Access Stratum (NAS) information is obtained from downlink PCell.
The configuration of component carrier can be performed by RRC and be reconfigured.Complete to activate and disable via MAC Control Element.
When transferring in LTE, RRC can also increase, remove or reconfigure SCell, for used in Target cell.Can be held by RRC
Row SCell's reconfigures, increases and removes.When transferring in the LTE, RRC can also increase, remove or reconfigure SCell, be used for
Target PCell is used.When new SCell is increased, dedicated RRC signaling is used for the institute's system letter in need for sending SCell
Breath, i.e. while in connection mode, UE directly need not obtain the system information of broadcast from SCell.
When user equipment is configured with carrier aggregation, there is a pair of always movable up-links and downlink component
Carrier wave.The downlink component carrier of this pair is also referred to as " DL anchor carrier waves ".This is equally applicable to up-link.
When carrier aggregation is configured, can the simultaneously scheduling user's set on multiple component carriers, it is but whenever most
Should only one of which random access procedure carrying out.Intersection carrier wave scheduling allows the PDCCH of component carrier in another component carrier
Upper scheduling resource.For this purpose, component carrier identification field, referred to as CIF are introduced in corresponding DCI format.
When no intersection carrier wave is dispatched, the association between up-link and downlink component carrier allows identification license
Be suitable for uplink component carrier.Association of the downlink component carrier to uplink component carrier is not necessarily required to one
To one.In other words, same uplink component carrier can be associated with more than a downlink component carrier.Meanwhile, one
Individual downlink component carrier can only be associated with a uplink component carrier.
LTE RRC states
Two principal states in LTE are below mainly described：" RRC_IDLE " and " RRC_CONNECTED ".
In RRC_IDLE, radio inertia, but ID is allocated and passes through network trace.More specifically, RRC_IDLE
In mobile terminal perform cell and select and gravity treatment-in other words, the mobile terminal determines which cell resided in.Cell is selected
(gravity treatment) process considers that each of each applicable radio access technologies (RAT) is suitable for the priority of frequency, radio link
Quality and cell status (that is, whether cell is prohibited (bar) or is retained).RRC_IDLE mobile terminals monitor paging channel
To detect calling on the horizon, and also obtain system information.System information mainly includes network (E-UTRAN) for controlling
Cell selects the parameter that (gravity treatment) is processed.RRC specifies the control signaling of the mobile terminal suitable for RRC_IDLE, i.e. paging
And system information.In TS 25.912, for example, in 8.4.2 chapters (being incorporated into this by quoting), it is stipulated that RRC_IDLE
In mobile terminal behavior.
In RRC_CONNECTED, mobile terminal has movable radio adaptation with the context in eNodeB.E-
UTRAN to mobile terminal assigning radio resources in order to (unicast) data via shared data channel transmission.In order to support
This operation, the control letter for indicating shared transmission resource dynamic assignment over time and frequency of mobile terminal monitoring association
Road.Mobile terminal provides report and the neighbor cell measurement letter of its buffer cell state and downlink channel quality to network
Breath, so that E-UTRAN can be the mobile terminal selects most appropriate cell.These measurement reports are included using other frequencies
Or the cell of RAT.UE also reception system information, which is mainly included using the information sent needed for channel.In order to extend its battery
Life-span, the UE in RRC_CONNECTED can be configured with discontinuous reception (DRX) cycle.RRC is E-UTRAN for controlling
The agreement of the UE behaviors in RRC_CONNECTED.
For the up-link access way of LTE
For up-link sends, the user terminal of high effect is needed to send so as to maximum coverage.It is chosen
Single carrier is combined with the FDMA assigned with dynamic bandwidth and sends the UTRA up-link sending methods as evolution.It is preferred that single
The main cause that carrier wave sends is, peak to average power ratio (PAPR) relatively low compared with multi-carrier signal (OFDMA), and
The power amplification unit efficiency and the improved coverage of hypothesis of corresponding raising is (for the higher number of given terminal peak power
According to speed).During each time interval, node B distributes unique time/frequency resource to user, for sending number of users
According to therefore ensuring that intra-cell orthogonality.Orthogonal access in up-link ensures spectrum efficiency by eliminating intra-cell interference
Improve.Help lead due to multipath transmisstion in base station (node B) process by Cyclic Prefix is inserted in sent signal
The interference of cause.
For data is activation basic physical resource be included in a time interval (for example, the subframe of 0.5ms) during chi
It is very little for BWgrantFrequency resource, the information bit of warp knit code is mapped in the frequency resource.It should be noted that subframe (also claims
For transmission time interval (TTI)) be user data send minimum interval.However, it is possible to will be compared by concatenating subframe
Frequency resource BW on the time period of one TTI lengthgrantDistribute to user.
For the uplink scheduling mode of LTE
Up-link mode supports that scheduling formula accesses (that is, by eNB control), and both access based on competition.
In the case where scheduling formula is accessed, UE is assigned the specific frequency resources (that is, time/frequency resource) of special time
Send for uplink data.However, it is possible to assign some time/frequency resources for the access based on competition.At this
In a little time/frequency resources, UE can be carried out sending without being scheduled first.UE carries out a feelings of the access based on competition
Shape is such as Stochastic accessing, i.e. when UE is performed to cell when being initially accessed or when being used to ask uplink resource.
For scheduling formula is accessed, node B scheduling unit distributes unique time/frequency resource for uplink to user
Circuit-switched data sends.More specifically, the scheduling unit determines
- allow which (which) UE sends,
- which physical channel resources (frequency),
- mobile terminal is used for the transformat (modulation coding mode (MCS)) for sending.
Assignment information signal is sent to UE via the scheduling grant sent in L1/L2 control channels.In order to simple and clear, under
This channel is referred to as " up-link grant channel " by face.Scheduling grant message is including at least which portion with regard to allowing UE service bands
The effectual time and UE divide, permitted are necessarily used for the information of the transformat that up-link on the horizon sends.It is most short to have
The effect period is a subframe.According to selected mode, additional information can also be included in grant message.Simply use
" per UE " permits to permit the right for sending on the ul-sch (that is, there is no " per UE per RB " license).Therefore, UE needs basis
Some rules are distributed assigned resource among radio bearer, this by ensuing part specifically
It is bright.It is different from HSUPA, there is no the transformat based on UE and select.ENB is based on the (scheduling for example, reported of some information
Information and QoS information) determining transformat, also, UE must comply with selected transformat.
Buffer cell state report/for the dispatch request process of uplink scheduling
Common scheduling method is dynamic dispatching, and which utilizes the downlink point of the assignment that resource is sent for downlink
The up-link grant message of the assignment of resource is sent with message and for up-link；These are generally for specific single
It is effective for subframe.As already mentioned previously, the message is sent on PDCCH using the C-RNTI of UE.Dynamic is adjusted
It is efficient to spend for business is to happen suddenly and is dynamic COS (such as TCP) in speed.
In addition to dynamic dispatching, continuous dispatching is also defined, which makes it possible in the time period than a sub- frame length to UE
It is semi-statically configured or assigning radio resources, thus avoids the need for the particular downlink on PDCCH for each subframe
Assignment messages or up-link grant message.Continuous dispatching for the service of such as VoIP be it is useful, wherein, for such as
The service of VoIP, packet are little, periodic and dimensionally semi-static.Therefore, the expense of PDCCH and dynamic tune
The situation of degree is compared and is substantially reduced.
Buffer cell state report (BSR) from UE to eNB is used to aid in eNodeB and assigns uplink resource, i.e.
Uplink scheduling, as being described in more detail in [2].For downlink scenario, eNB scheduling units obviously know to transmit
To the data volume of each UE；However, for uplink direction, because completing scheduling decision, and the buffering list of data in eNB
Unit is in UE, so BSR must be sent from UE to eNB, so as to the data volume for indicating to need to send on the ul-sch.
Basically there exist the two kinds of BSR for LTE definition：Long BSR and short BSR.Which UE sends and depends on passing
Available transmission resource, a how many group logic channels in defeated piece has not empty buffer unit and whether triggers particular event in UE.
Long BSR reports are for the data volume of four logic channel groups, and short BSR indicates the number only for highest logic channel group buffering
According to amount.Introduce logic channel group concept the reason for be：Even if UE may have the logic channel more than four configurations, it is each list
Only logic channel report buffer cell state also leads to too many signaling consumption.Therefore, eNB by each logical channel assignment extremely
Logic channel group；Preferably, the logic channel with identical/similar QoS requirements should be assigned in same logic channel group.
UE sends available transmission resource, the how many groups of logic channels which in short or long BSR is depended in transmission block
With not empty buffer unit and whether particular event is triggered in UE.Long BSR is reported for the data of four logic channel groups
Amount, and short BSR indicates the data volume only for highest logic channel group buffering.
Introduce logic channel group concept the reason for be：Even if UE may have the logic channel more than four configurations, it is every
Individual single logic channel report buffer cell state also leads to too many signaling consumption.Therefore, each logic channel is divided by eNB
It is assigned to logic channel group；Preferably, the logic channel with identical/similar QoS requirements should be assigned in same logic channel
In group.
As an example, BSR can be triggered for following event：
- whenever data are for arriving for the logic channel of the higher priority of the logic channel of non-NULL than buffer cell
Up to when；
- in the data that not can be used for before sending, when data are changed into available for any logic channel；
- whenever expiring the repeating transmission BSR times；
- whenever periodicity BSR report expire, i.e. when periodicity BSR timing unit expires；
- when in transmission block, presence can accommodate the clearance spaces of BSR.
In order to unsuccessfully have robustness to send, the BSR retransmission mechanisms of LTE definition are existed for；Whenever receiving uplink
When road is permitted, start or restart and retransmit BSR timing units.If not receiving uplink before the timing unit expires
Permit that then UE triggers another BSR in road.
If when BSR is triggered, UE is not assigned to for BSR to include the uplink resource in TB that then UE exists
Dispatch request (SR) is sent in physical uplink control channel (PUCCH) (if being configured with).For not configuring on PUCCH
The situation of D-SR (specific schedule request) resource, UE will start random access procedure (RACH processes), to ask for sending out
BSR information is sent to the UL-SCH resources of eNB.However, it should be noted that during for periodicity BSR is sent, UE will not trigger SR
Send.
Additionally, for define cycle constantly assigned resources so as to save for send license L1/2 control signalings
The particular schedule pattern (which is referred to as semi-continuous scheduling (SPS)) of expense, has been introduced into the enhancing sent to SR.It is main
An example for considering the service for semi-continuous scheduling is VoIP.Per 20 milliseconds, during the steep increasing (talk-spurt) of dialogue
VoIP packets are generated in codec unit.Therefore, eNB can assign up-link with every 20ms or correspondingly downlink is provided
Source, which is then used to send VoIP packets.Generally, SPS is for measurable business conduct (that is, constant bit rate, packet
The time of advent is periodic) service be beneficial.When SPS is configured for uplink direction, eNB can be closed
For the SR triggerings/transmission of the logic channel of particular configuration, i.e. as data are reached on the logic channel of those particular configurations
And caused BSR triggerings will not trigger SR.For this enhanced motivation is, for by the resource using semi-continuous assignment that
A little logic channels (carrying the logic channel of VoIP packets) report SR for eNB scheduling be it is nugatory, therefore should
It is avoided by.
With regard to BSR processes and particularly with regard to BSR processes triggering more details in 3GPP
It is illustrated in TS36.321V10.5 5.4.5 chapters (being incorporated into this by quoting).
Priority of logical channels sorts
UE has uplink rate control function, and which manages the shared of the uplink resource between radio bearer.
Also this uplink rate control function is referred to as into priority of logical channels sequencer procedure below.When the transmission for performing new (that is, is needed
Transmission block to be generated) when, using priority of logical channels sequence (LCP) process.One suggestion of partition capacity is with priority
Order has been received by dividing equivalent to minimum data rate for the carrying until each carries to each carrying Resources allocation
Till group, after this, with such as priority orders to any overhead provision of carrying distribution.
Such as will become apparent from from the description to LCP processes given below, resident (reside) is in UE
The enforcement of LCP processes is based on known token bucket (token bucket) model in IP fields.The basic functionality of this model is such as
Under.Periodically to give speed, would indicate that the token of the right for sending a certain amount of data is added to bucket.When UE has been licensed money
During source so which can send the data of the amount represented by the token number in up to bucket.When sending out data, UE is removed quite
In the token of the number of the amount for sending data.In the case where bucket is full, any other token is abandoned.For adding for token
Plus, it can be assumed that the cycle of this repetition for processing will be every TTI, but can easily lengthen the cycle so that only per second to add
Plus a token.Substantially, per millisecond is replaced to add a token to bucket, can be with 1000 tokens of addition per second.Below, describe
Priority of logical channels sequencer procedure [TS36.321] used in version 8.With regard to LCP processes more details in 3GPP
It is illustrated in TS 36.321V8 5.4.3.1 chapters (being incorporated into here by quoting).
RRC controls the scheduling of uplink data by the signaling for each logic channel：Priority is (preferential
Level), wherein increasing priority values indicates lower levels of priority；PrioritisedBitRate (Prioritized Bit rate), its
Prioritized Bit rate (PBR) is set；BucketSizeDuration (bucket size persistent period), which arranges the bucket size persistent period
(BSD).The thought of Prioritized Bit rate behind is to support minimum bit for each carrying (including that the non-GBR of low priority is carried)
Rate, to avoid potential inadequate resource.Each carrying should at least obtain enough resources to obtain Prioritized Bit rate (PBR).
UE should be each logic channel j and keep variable Bj.When interrelated logic channel is set up, Bj should be initialized as 0, and
And for each TTI, Bj is incremented by into the product of PBR × TTI persistent period, wherein, PBR is the Prioritized Bit rate of logic channel j.
However, the value of Bj must not exceed bucket size, and if the value of Bj should be then arranged more than the bucket size of logic channel j
For bucket size.The bucket size of logic channel is equal to PBR × BSD, and wherein PBR and BSD is by upper-layer configured.
When new transmission is performed, UE should perform following priority of logical channels sequencer procedure：
- UE will in following steps by assignment of resources to logic channel：
Zero step 1：With priority descending to all with Bj>0 logic channel assigned resources.If by radio bearer
PBR be set to " infinity ", then UE, will be for can be used for wireless before the PBR of low priority radio bearer is met
All data assigned resources of the transmission that electricity is carried；
Zero step 2：UE is by the overall size of the MAC SDU of the logic channel j for making Bj successively decrease and serving in step 1.
In this it should be noted that the value of Bj can be negative.
Zero step 3：It is if still there is any resource, all with strict priority descending (with the value of Bj independently) service
Logic channel, until the data or UL of the logic channel are permitted till depleted (no matter whichever first occurs).It is configured with equal
The logic channel of priority comparably should be serviced.
- UE also will comply with following rule during above scheduling process：
If zero whole SDU (or RLC PDU of the SDU that partly sends or repeating transmission) is adapted to surplus resources, UE should
This is by RLC SDU (or RLC PDU of the SDU that partly sends or repeating transmission) segmentation；
If the RLC SDU from logic channel are segmented by zero UE, which should maximize the size of the segmentation, to fill out as far as possible
Fill license；
Zero UE should maximize the transmission of data.
For priority of logical channels sequencer procedure, UE will consider following relative priority with descending：
- for the MAC Control Element or the data from UL-CCCH of C-RNTI；
- for the MAC Control Element of BSR, except the BSR for being included to fill；
- for the MAC Control Element of PHR；
- from the data of any logic channel, except the data from UL-CCCH；
- for be included to fill BSR MAC Control Element.
In the case of in the carrier aggregation that part describes after a while, multiple MAC are sent in a TTI when UE is requested
During PDU, step 1 to 3 and the rule for associating can independently using to each license, or the sum of the capacity for being applied to permit.
And, the order for processing license is implemented by UE.When UE is requested, and multiple MAC PDU are sent in a TTI, implement to come by UE
Decision is included MAC Control Element in which MAC PDU.
Up-link power control
Up-link transmission power control in mobile communication system is used for important purpose：Which is in order to required for obtaining
Service quality (QoS) and the needs to enough transmission energy of every bit and minimize the interference to other users of system
It is balanced and the needs of the battery life for maximizing mobile terminal between.In order to realize this purpose, required for for offer
, to the interference caused by neighbor cell, the role of Power Control (PC) is changed into conclusive for SINR simultaneously control.Up-link
The thought of middle classical PC modes is to receive all users with identical SINR, and which is known as being fully compensated.Alternatively, 3GPP
The use of fractional rating control (FPC) has been selected for LTE.This new feature make the user with higher path loss with
Lower SINR demands are operated, so as to they will be more likely to produce less interference to neighbor cell.
In LTE, it is physical uplink link shared channels (PUSCH), physical uplink control channel (PUCCH) and spy
Survey reference signal (SRS) and define specific Power Control formula (the 5.1st parts of TS 36.213).For each these it is up
The formula of link signal follows identical basic principle；In all situations, they are considered the summation of two dominant terms：
From eNodeB with the static or semi-static parameter that signal sends derive (derive) basic operated open-loop point and from subframe to
The dynamic deflection that subframe updates.
For every Resource Block transmit power basic operated open-loop point depend on Multiple factors, including presence of intercell interference and
Cell load.Which can be further broken into two components：Semi-static datum-plane P0, which is further included for institute in cell
The mutual power level (being measured with dBm) and UE for having UE specifically offsets；And open loop path loss compensation component.Per Resource Block
The dynamic deflection part of power can also be further broken into two components：Depend on component, the Yi Jixian of used MCS
Transmitting element Power Control (TPC) order of formula.
The component that MCS is relied on (is referred to as Δ in LTE specificationTF, wherein TF is the abbreviation of " transformat ") and make it possible to root
According to transmit power of the transmitted information data rate adaptation per RB.
Other components of dynamic deflection are the specific TPC commands of UE.These can be operated in two different modes：Accumulation
TPC command (available for PUSCH, PUCCH and SRS), and absolute TPC command (can only be used to PUSCH).For PUSCH, lead to
It is that each UE is semi-statically configured switching between these two regimes to cross RRC signaling --- i.e., it is impossible to dynamically change pattern.
By accumulation TPC command, each TPC command is sent relative to power step horizontal before with signal.
Timing advance
Up-link sending method for LTE, selects single-carrier frequency division multiple access (SC-FDMA) to realize in the uplink
Orthogonal multiple access between the different UE of transmission in time and frequency.
By assuring that being sent at the receiving unit of eNB for different UE from cell is time alignment, maintain
Line link orthogonality.This avoid between the UE for being assigned to be transmitted in continuous subframes and with adjacent sub-carriers on
There is intra-cell interference between the UE being transmitted.By applying fixed relative to the downlink for being received at UE transmitting elements
When timing advance, realize up-link send time alignment.This illustrates in Figure 5.The Main Function of time alignment is
Offset the different propagation delays between difference UE.
Timing advance process
When UE is synchronous with the downlink transmission received from eNB, initial timing arranged by random access procedure and is carried
Before.This is related to UE and sends random access lead code, and from the random access lead code, eNodeB can be with estimating uplink timing simultaneously
Responded with 11 bit initial timing advance commands being included in accidental access response (RAR) message.This causes eNodeB
Can be from 0 up to maximum 0.67ms with the granularity configuration timing advance of 0.52 μ s.
Once being provided with timing advance firstly for each user equipment, timing advance just updates to offset with the time
Change of the uplink signal in the time of advent of eNodeB.When timing advance more newer command is derived, eNodeB can be measured
Any useful uplink signal.The details of the uplink timing measurement at the eNodeB do not specify, but by eNodeB
Implement.
Timing advance more newer command is generated in media access control (MAC) layer in the enodeb, and is controlled as MAC
Unit and send to user equipment, MAC Control Element can be with the data-reusing on physical down link sharing channel (PDSCH)
Together.As the initial timing advance command in response to RACH (RACH) lead code, more newer command has
The granularity of 0.52 μ s.The scope of more newer command is ± 16 μ s, so that the step change of uplink timing can be equal to
The length of the Cyclic Prefix of extension.The more newer command generally will not be than about more frequently being sent per 2 seconds.In fact, quick
Renewal is unlikely to be necessary, this is because, even for the user equipment moved with 500km/h, the change of trip path length
Change, which corresponds to the two-way time change of 0.93 μ s/s.
When timing advance order is received, UE will adjust the uplink of its PUCCH/PUSCH/SRS for being used for main plot
Road sends timing.Timing advance order is indicated relative to as 16TSMultiple current Uplink timing up-link it is fixed
When change.UL for the PUSCH/SRS of secondary cell sends regularly identical with main plot.
In the case of accidental access response, 11 bit timing advance command TABy index value TA=0,1,2 ..., 1282
Indicate NTAValue, wherein the amount of time alignment is by NTA=TA× 16 are given.NTADefined in [3].
In other cases, 6 bit timing advance command TABy index value TA=0,1,2 ..., 63 indicate current NTAValue
NTA,oldTo new NTAValue NTA,newAdjustment, wherein NTA,new=NTA,old+(TA-31)×16.Here, to NTAThe positive or negative amount of value adjustment
Indicate that up-link is sent timing is advanced or delayed specified rate respectively.
For the timing advance order received in subframe n, corresponding timing adjustment will be applied from the starting of subframe n+6
Plus.When up-links PUCCH/PUSCH/SRS of the UE in subframe n and subframe n+1 sends to be overlapped due to timing adjustment, UE
The lap of subframe n+1 is not sent transmission complete subframe n and.
If the downlink timing for receiving changes, and is not compensated for or adjusts only portion by uplink timing
By compensation without the timing advance order as specified in TS36.133, then UE correspondingly changes N for point groundTA。
ENodeB balances send the expense and UE of all UE in regularly (regular) timing more newer command to cell
Reach the quick ability for sending when which sends buffer cell when data.ENodeB is therefore single for each user device configuration timing
Unit, whenever timing advance renewal is received, user equipment restarts the timing unit.This timing unit is also known as regularly carried
Front timing unit (TAT).In the case where user equipment did not received another timing advance renewal before timing unit expires, use
Family equipment then must take into which and lose uplink synchronisation (referring further to 36.321 " Evolved of 3GPP TS
Universal Terrestrial Radio Access(E-UTRA)；Medium Access Control(MAC)protocol
5.2nd part of specification " version 8.9.0, which is in http://www.3gpp.org can be obtained and by by drawing
With merging here).
In this case, the wind of the interference for the up-link from other user equipmenies being sent in order to avoid generation
Danger, does not allow another up-link that UE carries out then form to send.
The adeditive attribute of timing advance process can be in the TS36.321 and TS36.133 (parts being hereby incorporated
7.1) find in.
LTE device-to-devices (D2D) are closely serviced
Emerging social technology trend is represented based on in-plant application and service.Determined by field include and operator
With user by commerce services interested relevant with public safety service.Closely service (ProSe) ability is introduced in LTE
To enable 3GPP industries serve this developing market, and while the several public affairs for being devoted to jointly LTE will be served
Altogether safety bodies in the urgent need to.
Device-to-device (D2D) communication is the technology ingredient of LET versions 12.Device-to-device (D2D) communication technology
So that D2D can increase spectrum efficiency as the bottom (underlay) of cellular network.For example, if cellular network is LTE,
Then all data for carrying physical channel are used for D2D signalings using SC-FDMA.In D2D communications, user equipment (UE) is being used
On the direct link of cell resource, rather than by base station, data signal is sent to each other.Figure 7 illustrates the compatible communications of D2D
Possible case in system.
D2D communications in LTE
" the D2D communications in LTE " two fields of concern：It was found that and communication；And major part of the present invention is related to discovery part.
Device-to-device (D2D) communication is the technology ingredient of LTE-A.In D2D communications, UE is using cell resource
Direct link on, rather than by BS, send data signal to each other.D2D user while being maintained under the control of BS,
That is, at least when in the coverage of eNB, direction communication.Therefore, D2D can improve system by reusing cell resource
Performance.
Assume D2D up-link LTE frequency spectrum (in the case of FDD), or be given coverage cell uplink
Operation in way frame (when in the tdd case, in addition to being coverage).Additionally, D2D is sent/is received in given load
Full duplex is not used on ripple.From for the angle of single UE, on given carrier wave, D2D signals are received and LTE up-links are sent out
Send, i.e. at the same D2D signals receive and LTE UL send be impossible.
In D2D communications, when UE1 has role's (send user equipment or send terminal) for sending, UE1 sends data
And UE2 (receive user equipment) receives the data.What UE1 and UE2 can change them sends and receives role.From UE1
Send can be by one or more UE of such as UE2 receptions.
With regard to user-plane protocol, content (the 3GPP TS of the agreement from for the angle of D2D communications are reported below
The 9.2nd parts of 36.843 version 12.0.0, are incorporated into this by quoting)：
-PDCP：
○1:M D2D broadcast communication datas (that is, IP packets) should be treated to common user panel data.
Header-compression/de-compression in zero PDCP is applied to 1:M D2D broadcast communications.
The header-compressed that ■ U- patterns are used in the PDCP of the D2D broadcast operations of public safety.
-RLC：
Zero RLC UM are used for 1:M D2D broadcast communications.
Zero RLC UM are supported to be segmented on L2 and are reset (re-assmebly).
Zero reception UE needs to maintain at least one RLC UM entities for each transmission equity UE.
Zero need not configure RLC UM receiving entities before a RLC UM units are received.
Zero up to the present, for the RLC AM or RLC TM of the D2D communications sent for user plane data, does not also know
It is clipped to needs.
-MAC：
Zero for 1:M D2D broadcast communications and assume HARQ feedback.
Zero reception UE needs to know source ID, to recognize reception RLC UM entities.
Zero MAC header includes L2 Target ids, and which allows in MAC layer filter packets.
Zero L2 Target ids can be broadcast, multicast or unicast address.
■ L2 multicasts/unicast：Even if the L2 Target ids carried in MAC header will cause to pass in the RLC UM PDU that will be received
The RLC UM PDU can also be abandoned before being handed to RLC receiving entities.
■ L2 are broadcasted：Receive UE and will process from all transmitting elements all RLC PDU for receiving, and be intended to reset and pass
Pass IP to be grouped to upper strata.
Zero MAC sub-headers include LCID (to distinguish multiple logic channels).
Zero at least multiplex/demultiplex, priority processing and filling is useful for D2D.
Assignment of resources
Radio resource assignment
Behavior of Fig. 9 diagrams with regard to the assignment of resources in D2D communications.Assignment of resources for D2D communications is in discussion
In, and with its current shape 3GPP TS36.843 version 12.0.0 9.2.3 parts (being incorporated into this by quoting)
Described in.
From the angle for sending UE, enable the UE (enabling the UE of ProSe) for closely servicing and may operate in for resource point
In two patterns of group：
- pattern 1 (assignment of resources of eNB scheduling)：The accurate money used by eNodeB or 10 via node of version scheduling UE
Source is sending immediate data and direct control information.UE needs to be RRC_CONNECTED, to send data.Additionally, UE from
ENB requests send resource, and eNB is dispatched for sending the scheduling resource of dispatching distribution and data.UE sends scheduling to eNB please
(D-SR or Stochastic accessing) is asked, BSR is followed by.Based on BSR, eNB can determine that UE has what is sent for ProSe direction communications
Data, and the resource needed for estimating to send.
- pattern 2 (selection of UE primary resources)：UE oneself selects resource from resource pool to send immediate data and directly control
Information
UE will be substantially dependent on RRC state (i.e., for D2D data is activations using what assignment of resources pattern
RRC_IDLE and RRC_CONNECTED) and UE coverage state (that is, in coverage, outside coverage).Such as
Fruit UE has Serving cell (that is, UE is RRC_CONNECTED or resides in cell in RRC_IDLE), then it is assumed that
UE is in coverage.
Specifically, it is applied to UE with regard to the following rule of assignment of resources pattern (according to TS36.300)：
If-UE is outside coverage, UE can only use pattern 2；
If-UE is in coverage, UE can in the case where eNB correspondingly configures which use pattern 1；
If-UE is in coverage, UE can in the case where eNB correspondingly configures which use pattern 2；
- when no exceptional case, UE slave patterns 1 only when eNB is configured as so making change to pattern 2 or
Slave pattern 2 changes to pattern 1.If UE is in covering, UE will use only and the pattern for indicating is configured by eNB, unless exception feelings
One of condition occurs；
- UE thinks its own in exceptional case, while T311 or T301 are in operation；
- when exceptional case occurs, even if UE is configured with pattern 1, also allow the interim use patterns 2 of UE.
When in the overlay area of E-UTRA cells, UE by the UL carrier waves only in the resource distributed by the cell only
Perform ProSe direction communications to send, even if the resource of the carrier wave is preconfigured for example in UICC and such.
For the UE in RRC_IDLE UE, eNB can select in following option：
- eNB can provide pattern 2 in SIB and send resource pool.The UE of authorized ProSe direction communications is in RRC_IDLE
Used in these resources be used for ProSe direction communications；
- eNB can indicate in SIB that but eNB supports D2D does not provide the resource for ProSe direction communications.UE needs
Sent into RRC_CONNECTED with performing ProSe direction communications.
For the UE in RRC_CONNECTED：
Being authorized to when needing and performing the transmission of ProSe direction communications in-RRC_CONNECTED performs ProSe and directly leads to
To eNB, the UE that letter sends indicates that the UE wishes to carry out the transmission of ProSe direction communications；
Using the UE contexts received from MME ,-eNB verifies that whether authorized UE ProSe in RRC_CONNECTED be straight
Connect letter to send；
When-eNB can be configured in UE among RRC_CONNECTEDs for the UE in RRC_CONNECTED by dedicated signaling
2 assignment of resources of pattern that can be used without restrictions sends resource pool.Alternatively, eNB can be RRC_ by dedicated signaling
UE configurations in CONNECTED allow 2 resource of pattern point that user (otherwise depends on pattern -1) only used in exceptional case
Distribute and send resource pool.
In mode 1, UE sends resource from eNodeB requests.ENodeB is dispatched for sending sending out for dispatching distribution and data
Send resource.
- UE sends dispatch request (D-SR or RA) to eNodeB, is BSR after the dispatch request, based on the BSR,
ENodeB can determine that UE is intended to perform D2D communications and the desired amount of resource.
- in mode 1, UE needs what is connected for RRC, to send D2D communications.
For pattern 2, UE is selected for sending resource pool (time and the frequency of the resource of D2D communications from which equipped with them
Rate).
Fig. 8 is schematically illustrated covering (Overlay) (LTE) and bottom (Underlay) (D2D) sends and/or receives money
Source.ENodeB control UE can be sent with application model 1 or pattern 2.Once UE knows which can send (or reception) D2D communications
Its resource, which is just only used for corresponding transmission/reception using corresponding resource.In the example of fig. 8, D2D subframes will only
For receiving or sending D2D signals.Because will operate in semiduplex mode as the UE of D2D equipment, the UE can be
Random time point is received or sends D2D signals.Similarly, in the figure, other subframes can be used for LTE (covering) send and/or
Receive.
D2D be the discovery that identification it is nigh other there is the process/process of D2D functions and equipment interested in D2D.For
This, it is desirable to the D2D equipment being found will send some and find signal (in particular network resource), and to the discovery signal sense
The reception UE of interest will be appreciated by such transmission D2D equipment.What the 8th chapter of 3GPP TS36.843 described D2D discovery mechanisms can
The details of acquisition.
For the transmission process of D2D communications
Figure 10 is shown schematically for the transmission process of D2D communications.D2D data transmission procedures are according to assignment of resources pattern
And it is different.As described previously for pattern 1, eNB explicitly dispatches the resource for dispatching distribution and D2D data communication.Hereinafter,
For 1 assignment of resources of pattern, the different step of request/admission process is listed：
- step 1：UE sends SR (dispatch request) to eNB via PUCCH；
- step 2：Via the PDCCH that (scramble) is scrambled by C-RNTI, eNB permits that UL resources (are sent for UE
BSR)；
- step 3：UE sends the D2D BSR for indicating buffer cell state via PUSCH；
- step 4：PDCCHs license D2D resource (for UE send data) of the eNB via D2D-RNTI scramblers；
- step 5：D2D Tx UE send SA/D2D data according to the license for receiving in step 4.
Dispatching distribution (SA) is compact (low payload) message comprising control information, and the control information is for example arrived and is used for
The pointer of the running time-frequency resource of corresponding D2D data is activations.The license received in the content of SA substantially above-mentioned steps 4.D2D is permitted
Can also not fix with the fine detail of SA contents.
D2D has found
ProSe (being based on in-plant service) directly has found to be defined as by the UE for enabling ProSe for via PC5 interfaces
Using the direct radio signals of E-UTRA find its closely interior other enable ProSe UE process.Figure 11 is schematically
The PC5 interfaces directly found for device-to-device are illustrated, such as in Error！Use the Home tab to apply ZA to
Described in the text that you want to appear here.
Upper strata process for find information declaration (announcement) and monitoring mandate.For this purpose, UE must be exchanged
Predefined signal (referred to as finding signal).By periodically checking discovery signal, UE maintains the list of closely UE, to work as
Need during communication link, to set up the communication link.Even in low signal-to-noise ratio (SNR) environment, discovery letter should be also reliably detected
Number.In order that discovery signal periodically can be sent, should distribute for finding the resource of signal.
There is two kinds of ProSe directly to find：Open and restraint-type.It is open need not be from being found
The display of UE is permitted, and restraint-type finds occur only as the display from the UE being found is permitted.
The direct discoveries of ProSe can be that the stand-alone service in the UE for being found enables unit, and which allows to carry out discovery
UE can use the information from the UE being found to be used for application-specific.As an example, the information that ProSe is sent in directly finding
Can be " taxi near finding ", " finding cafe to me ", " finding nearest police office to me " etc..By ProSe
Directly find, it is found that UE can obtain (retrieve) information needed.In addition, according to the information for obtaining, ProSe directly has found can
With the subsequent action being used in communication system, such as, start ProSe direction communications.
ProSe directly has found model
ProSe is directly had found based on several discovery models.In 23.303 V12.0.0 5.3.1.2 parts of 3GPP TS
The model directly found for ProSe defined in (being incorporated into this by quoting)：
Model A (" I here ")
Model A is also shown as " I here ", this is because the UE for being declared broadcast in message is found with regard to its from
Oneself information, such as, thus its ProSe application identities or ProSe UE mark in discovery information identifies their own and passes
It is handed to other sides of obtainable communication system.
According to Mode A, define for participating in two roles of the UE for enabling ProSe that ProSe directly has found.Enable
The UE of ProSe can have the function of the UE for being declared and the UE for being monitored.Declared UE declaration can by by
Permit the customizing messages that closely UE is used for finding.The closely interior sense of the UE declared by the UE monitoring for being monitored is emerging
The customizing messages of interest.
In this model, the UE for being declared has found to be spaced broadcast discovery messages with predefined, also, to these message senses
The UE that the carrying out of interest monitors reads them and simultaneously processes them.
(" who is at that for Model B"/", you were at that”)
This model is used for two roles for participating in the UE for enabling ProSe that ProSe directly has found：
- discovery side UE：The UE is sent comprising with regard to its request for finding what customizing messages interested；
- the side of being found UE：The UE for receiving request message can be responded with certain relevant with the request of discovery side information.
Model B be equivalent to " who that/you are at that", this is because discovery side UE sends the information with regard to other UE, its
In be intended to receive response from described other UE.Transmitted information for example can be with regard to the ProSe application identities corresponding to a group.
The member of group can be in response to transmitted information.
According to this model, definition participates in two roles of the UE for enabling ProSe that ProSe directly has found：It was found that side UE and
The side of being found UE.It was found that side UE is sent comprising with regard to its request for finding what customizing messages interested.On the other hand, sent out
Now side UE receives request message, it is possible to responded with certain relevant with the request of discovery side information.
It was found that the content of information is transparent to Access Layer (AS), the Access Layer does not know the content of discovery information.Therefore,
Directly find that the type that model and ProSe directly have found directly does not make a distinction in each ProSe in Access Layer.ProSe
Agreement guarantees which only transmits effective discovery information to AS for declaration.
Configure according to eNB, in RRC_IDLE and RRC_CONNECTED states, UE can participate in a surname of discovery information
Accuse and monitor.UE declares and monitors which is subject to the discovery information that half-duplex is constrained.
It was found that type
Figure 12 illustrates that IDLE (free time) and CONNECTED in the reception of the discovery resource in D2D communications (connect
Connect) figure of pattern.
D2D communications can be that network is controlled, and wherein operator's management is directly transmitted between (D2D) and legacy cellular link
Switching；Or direct link can be by equipment control, and without the need for operator's control.D2D allows to merge infrastructure mould
Formula and ad hoc communications.
Generally, equipment is periodically needed to find.Additionally, D2D equipment utilizations find message signaling protocol to perform equipment
It was found that.For example, enable D2D UE can send its find message, and another UE for enabling D2D receive this find message and
Can use the information to set up communication link.The advantage of hybrid network is：If D2D equipment is also in the logical of network infrastructure
In letter scope, then message is found as the network entity of eNB can additionally aid in transmission or configure.In order to ensure D2D message not
Cellular services to being controlled by eNB produce interference, and coordination/control that eNB is carried out in the transmission or configuration for finding message is also
Important.In addition, even if some in equipment are outside network coverage, the equipment in coverage can also help ad-
Hoc has found agreement.
For the purpose that the term for further using in the de-scription is defined, the discovery of following two types is at least defined
Journey.
- Class1：Assign on the basis of non-UE is specific for declaring the assignment of resources process of the resource of discovery information, its
Feature is further：
Zero eNB is provided to UE and is configured for the resource pool for declaring discovery information.The configuration can be sent out with signal in SIB
Send.
Zero UE independently selects radio resource from indicated resource pool and declares discovery information.
Zero UE can declare during each discovery period with regard to the randomly selected discovery information for finding resource.
- type 2：Assign on the basis of every UE is specific for declaring the assignment of resources process of the resource of discovery information, its
Feature is further：
UE in zero RRC_CONNECTED can be asked for declaring the resource of discovery information from eNB via RRC.ENB Jing
By RRC Resources allocation.
Assigned resources in zero resource pool configured in the UE for monitoring.
Resource is assigned by such as semi-continuous according to 2 process of type, and which is assigned to the transmission for finding signal.
In the case where UE is in RRC_IDLE patterns, eNB can select one of following option：
- eNB can provide in SIB for find information declaration Class1 resource pool.Authorized ProSe directly has found
UE these resources used in RRC_IDLE be used for declare discovery information.
- eNB can indicate in SIB its support D2D, but do not provide for find information declaration resource.UE needs
Into RRC_CONNECTED, to ask for finding the D2D resources of information declaration.
For the UE in RRC_CONNECTED states, it is authorized to execution ProSe and directly finds that the UE for declaring refers to eNB
Show that the UE wishes to carry out D2D and finds declaration.Then, whether eNB is authorized to using the UE context validations UE received from MME
ProSe directly has found declaration.UE can be configured so that Class1 resource pool or private type 2 via dedicated RRC signaling by eNB
Resource is used to find information declaration (or not using resource).The resource assigned by eNB is until a) eNB is by RRC signaling releasing
Configure the resource or b) UE into just effective till IDLE.
Reception UE in RRC_IDLE and RRC_CONNECTED monitors sending out for both the Class1 as authorized and type 2
Existing resource pool.ENB is provided in SIB and is configured for the resource pool for finding resource monitoring.SIB can be comprising for also adjacent little
The discovery resource declared in area.
Radio protocol architecture
Figure 13 is schematically illustrated the wirelessly protocol stack (AS) directly found for ProSe.Need the Figure 13 for updating.
AS layers are connected with upper strata (ProSe agreements).Therefore, MAC layer receives discovery information from upper strata (ProSe agreements).
In this context, IP layers are not used in transmission discovery information.Additionally, AS layers have scheduling feature：MAC layer determine to be used for declare from
The radio resource of the discovery information that upper strata receives.In addition, AS layers have generates the function of finding PDU：MAC layer builds to carry and sends out
The MACPDU of existing information, and MAC PDU are sent to physical layer, for being transmitted in the radio resource determined by.
Without MAC header.
In UE, RRC agreements will be seen that resource pool is notified to MAC.The type 2 for sending assigned also is provided by RRC
Source is notified to MAC.MAC header is not needed.MAC header for finding does not include what the filtration on executable 2nd layer was based on
Any field., disappear in the other discovery of MAC level compared with upper strata performs filtration with based on ProSe UE- and/or ProSe application ID
Breath filtration seems not save process or power.The discovery message of all receptions is all forwarded to upper strata by MAC receiving units.MAC will
The message being properly received is transmitted only to upper strata.
Hereinafter it is assumed that L1 indicates whether to have proper reception of discovery message to MAC.Moreover, it is assumed that upper strata ensure only to
Access Layer transmission effectively finds information.
Prior art solution for assigning for the resource of the discovery in D2D systems does not allow to be suitable for being asked
D2D service mode determine the resources mode or configuration for being suitable to assigned resources.Specifically, based on by setting with D2D functions
The standby information sent according to common signaling procedure, base station can assign transmission resource within the very short time period, for causing UE
Complete discovery information can be broadcasted.Therefore, sending UE needs to ask resource again, thus causes to open LTE system increase signaling
Pin.
Additionally, for example, with regard to finding that the information of content of information is transparent for Access Layer (AS).Therefore, exist
In Access Layer, directly find not make a distinction between the type that model and ProSe directly have found in various ProSe, also, base
Stand and do not received for the model and the type of the preferred process for finding resource is useful to appoint for assigning that determine that discovery sends
What information.
D2D synchronizations
Synchronous main task is so that receiving unit can obtain time and frequency resource.Can be using this with reference to use
In at least two purposes：1) when D2D channels are detected, alignment receives window and frequency correction；And 2) when send D2D channels when pair
It is accurate to send timing and parameter.Up to the present, defined for synchronous purpose with lower channel in 3 gpp.
Additionally, having been decided through consultation below in relation to synchronous term in 3 gpp.
D2D synchronisation sources：The node of D2D synchronizing signals is sent at least.
D2D synchronizing signals：UE can from its obtain timing Frequency Synchronization signal.
D2D synchronisation sources can substantially be eNB and D2D UE.
D2D can synchronously be counted as the process similar to LTE cell searchings.In order to realize for local/outside covering model
Enclose NW controls and both high efficiency synchronous of situation, in procedure below discussion currently in 3GPP.
Receiving unit synchronization
Enable the UE periodic search LTE cells (according to LTE mobile process) and the D2DSS/ sent by SSUE of ProSe
PD2DSCH。
If it find that any suitable cell, then UE is resided over and is followed cell synchronous and (left according to LTE
Journey).
If it find that any suitable D2DSS/PD2DSCH sent by SS UE, then UE be sent to unit with it is all i.e.
By the D2DSS/PD2DSCH for arriving synchronous (being limited by UE abilities) and them are monitored for connection on the horizon (scheduling
Distribution).It should be noted that the D2DSS sent by the D2D synchronisation sources as eNodeB will be version 8PSS/SSS.As eNodeB's
D2D synchronisation sources have the higher priority of the D2D synchronisation sources for being used for UE.
Transmitting element synchronization
Enable the UE periodic search LTE cells (according to LTE mobile process) and the D2DSS/ sent by SSUE of ProSe
PD2DSCH。
If it find that any suitable cell, then UE is resided over and is followed cell synchronous and sends out for D2D signals
Send, NW can configure UE D2DSS/PD2DSCH is sent after cell synchronous.
If it was found that suitable cell, arbitrary in UE verifications (verify) D2DSS/PD2DSCH on the horizon
It is individual can be by further relaying (that is, also not up to maximum hop count), then, (a) if it find that further can be relayed i.e.
The D2DSS/PD2DSCH that will be arrived, then UE make its transmitting element synchronous, and correspondingly send D2DSS/PD2DSCH；Or
If b () does not find the D2DSS/PD2DSCH on the horizon that further can be relayed, UE work is independent synchronization
Source, and referred to according to any internal synchronization and send D2DSS/PD2DSCH.
Can find in TS36.843 with regard to other details of the synchronizing process for D2D.
The user equipment with D2D functions or transmission terminal general knowledge in RRC idle conditions passes through direct link
When communication sends data to the reception UE with D2D functions, the problem in D2D communication systems occurs.Lead to set up D2D
Letter, sending terminal needs control to send timing and will send timing information to be transferred to receive UE.This allows base station at which
Smooth (well) inside the reception FFT windows of ICI (inter-carrier interference) is prevented to receive all signals on the horizon, such as D2D sends out
Send data and the data sent in LTE/WAN up-links.On the uplink channel with the communication of eNodeB in, in UE
Place determines transmission timing based on timer command or timing advance (TA) order received from eNB.
However, when UE is sent in RRC idle pulleys, UE receives any timing advance not from network or from eNodeB
Order.Therefore, D2D sends UE and can send timing value by using direct link, controls to receive UE for sending data to
Transmission timing, the direct link sends timing value and do not allow to receive base station or eNodeB to receive at which and smoothly connect inside FFT windows
All signals on the horizon (D2D and LTE/WAN up-links) are received, thus to user equipment in the cell and eNodeB
Between uplink communication produce interference.Additionally, eNodeB does not know or does not control covering in RRC idle conditions
UE in scope.Consequently, because send UE in the idle pulley, so UE rightly cannot be carried out work(based on every UE
Rate is controlled for sending data by direct link.This is in the reception by eNodeB on up-link LTE channel to data
Middle generation WAN and ICI interference.Produced interference is also had a negative impact and causes SNR to decline to decrypting performance.
It is to implement ICI in a base station to alleviate to the known solution of this problem in order to avoid inter-carrier interference
(mitigation) technology.Such technology is for example included between LTE resources and D2D resources implements protection band.Protection band
Amount is by depending on the interference volume to WAN.However, this solution implies use in the enodeb to ample resources.
The content of the invention
The disclosure sends D2D in the case where reception interference is not produced by providing the transmission UE for alloing idle pulley
Data and the apparatus and method that need not utilize ample resources in the enb, propose the solution to the problems referred to above.
The solution is described in the independent claim.Favourable development is the theme of dependent claims.
One exemplary embodiment is provided for sending data to reception by direct link connection in a communications system
The transmission terminal of terminal.The transmission timing that terminal determines the direct link data is activation in communication system is sent, and includes reception
Unit, which receives the timing for the data is activation in adjacent end determination by direct link from least one adjacent end
Direct link timing information.Signal generating unit is based on the direct chain sent for direct link received from least one adjacent end
Road timing information, generates derived direct link timing information, and a direct link timing information derived from institute can be by transmission terminal
Timing value is sent for the derived direct link for determining the timing of the data is activation by direct link for generating.Additionally,
Transmitting element sends direct link timing information derived from institute to receiving terminal.Direct link timing information derived from institute is being received
Terminal can be used for generation will be from the direct chain of the reception timing for sending terminal data to be received on direct link for determination
Road receives timing value, and in base station/eNodeB for its receive smoothly receive inside FFT windows such as D2D data and
The whole signal on the horizon of the data sent in LTE/WAN up-links.
The additional benefits and advantage of the disclosed embodiments will be apparent from specification and drawings.The benefit and/
Or advantage can be provided respectively by the feature of each embodiment disclosed in specification and drawings, and all need not be provided
To obtain one or more.
Description of the drawings
Exemplary embodiment is described in more detail below with reference to the accompanying drawings.Similar or corresponding details identical label in figure
Mark.
Fig. 1 shows the exemplary architecture of 3GPP LTE systems；
Fig. 2 shows the example overview of the overall E-UTRAN frameworks of 3GPP LTE；
Fig. 3 shows the illustrative sub-frame in the downlink component carrier defined in 3GPP LTE (version 8/9)
Border；
Fig. 4 is shown such as the exemplary downlink money of the downlink time slots defined in 3GPP LTE (version 8/9)
Source lattice (grid)；
Fig. 5 and Fig. 6 respectively illustrate the 3GPP of the carrier aggregation with the activation for downlink and up-link
LTE-A (version 10) the 2nd Rotating fields；
Fig. 7 is the schematic diagram for illustrating the system including the user equipment with D2D functions；
Fig. 8 is to illustrate that covering (LTE) in D2D subframes and bottom (D2D) send and receive the schematic diagram of resource；
Behavior of Fig. 9 diagrams with regard to the assignment of resources in D2D communications；
Figure 10 is shown schematically for the transmission process of D2D communications；
Figure 11 illustrates schematically illustrating for the PC5 interfaces directly found for device-to-device；
Figure 12 is the figure for illustrating IDLE the and CONNECTED patterns in the reception according to the discovery resource of example sexual development；
Figure 13 is schematically illustrated the radio protocol stack (AS) directly found for ProSe；
Figure 14 is illustrated for the controls of the transmission UE (left-hand side) in UE (right-hand side) and connection mode are sent by idle pulley
Send the possibility mode of timing；
Figure 15 illustrates the transmission/receive user equipment according to example sexual development；
Figure 16 is the flow chart for describing the idle transmission timing configured for sending UE；
Figure 17 schematically shows compared with the positioning that the FFT that such as determined by connection mode D2D UE receives window, such as root
The positioning of window is received according to the FFT in the case of idle pulley D2D UE that the method for the present invention determines.
Specific embodiment
Paragraphs below will describe each exemplary embodiment.Only for exemplary purpose, with regard to basis in background above
The 3GPP LTE (version 8/9) partly discussed in technology segment and the nothing of LTE-A (version 10/11/12) mobile communication system
Line is electrically accessed mode and summarizes most of embodiment.It should be noted that exemplary embodiment for example can be advantageously used in such as such as existing
In the mobile communication system of 3GPPLTE-A (version 10/11/12) communication system described in background section above, but,
Exemplary embodiment is not limited to their uses in this particular exemplary communication network.
Claims and terminology used herein " direct link " should be understood two D2D user equipmenies it
Between communication link (communication channel), this allows to direct exchange data and need not be related to network.In other words, in communication system
In two user equipmenies between set up communication channel, described two user equipmenies sufficiently close to bypass with direct exchange data
ENodeB (base station).Be contrasted with " LTE links " or " LTE (up-link) business " using this term, " LTE links " or
" LTE (up-link) business " refers to the data service between the user equipment managed by eNodeB in addition.
Claims and terminology used herein " transmission user equipment " should be understood to send and receive
The mobile device of data.Adjective " transmission " is only used for illustrating interim operation.Below in order to find send purpose transmission user
Equipment can be declaration user equipment or find user equipment (it was found that side).Using the term and " receive user equipment " or
" receiving terminal " is contrasted, and " receive user equipment " or " receiving terminal " refers to the movement of the operation for provisionally performing receiving data
Equipment.Below in order to the receive user equipment for finding transmission purpose can be that monitoring user equipment or user to be found set
Standby (side of being found).
Hereinafter, several examples be will be explained in.Illustrate to be understood not to limit the present invention, but be considered merely as be
Exemplary embodiment, to more fully understand the present invention.Technical staff should be understood that the General Principle as stated in claims can
So that different situations are applied in the way of not explicitly described herein.Therefore, in order to each embodiment illustration purpose assume with
Lower situation should not be so limited.
The present invention is based on following observation：User equipment or transmission in D2D communication systems, in RRC idle conditions
Terminal may send data to the reception UE with D2D functions by direct point-to-point data link.In order to set up D2D communications, send
Terminal needs control transmission timing and will send timing information to be transferred to receive UE so that receives UE and can position FFT reception windows.
However, because sending UE in RRC idle pulleys, sending UE not from network or receiving any timing advance from eNodeB
Order, wherein, based on the timing advance order, send UE and can estimate for determining determining for the data is activation by direct link
When accurate direct link send timing value.Therefore, D2D sends UE and may send out to UE transmissions direct link as follows is received
Timing value is sent, i.e., which does not allow base station/eNodeB to receive at which and all of signal on the horizon is smoothly received inside FFT windows
(D2D and LTE/WAN up-links), thus in uplink WAN communications (that is, user equipment in the cell and eNodeB
Between) middle generation interference.Additionally, eNodeB does not know or does not control the UE in coverage in RRC idle conditions.
Consequently, because UE is sent in idle pulley, so sending UE cannot rightly be carried out Power Control for by straight
Chain link road sends data.This produces WAN interference in the reception by eNodeB on up-link LTE channel to data.
The solution to the problems referred to above will be illustrated with reference to Figure 14.According to this solution, the transmission UE of idle pulley can
Timing is sent to control direct link using using quantity of information timing as reference.
Figure 14 is illustrated for the controls of the transmission UE (left-hand side) in UE (right-hand side) and connection mode are sent by idle pulley
Send the possibility mode of timing.
The left-hand side of Figure 14 is related to by the transmission UE (the also referred to as UE of connection from now on) in RRC connection status
The D2D data is activations for carrying out.According to this configuration, the UE of connection will postpone to receive downlink channel from eNodeB with particular propagation
On data.As above illustrated in introductory section, in order to synchronization is sent from the downlink that eNB is received, UE sends at random
Access lead code, eNodeB can shift to an earlier date from the random access lead code estimating uplink timing and with 11 bit initial timings
Command response.Timing advance order is determined to the data is activation of eNB on the uplink channel for control at the UE of connection
When.
According to the configuration of the left-hand side of Figure 14, the UE of connection using with from the UE being connected for the uplink way to base station
According to transmission (LTE uplink timings) identical uplink timing.For this purpose, internal timing can for example be shifted to an earlier date by the UE of connection
Value is adjusted to 11 bit values (referred to as NTAValue).This N for generatingTAThe also connected UE of value (that is, LTE uplink timings) is used for
D2D data is activations.Specifically, NTAValue is used for adjustment for base station and sending out by direct link transmission data from the UE for connecting
Timing is sent, and also as the basis of the FFT windows that UE is received for synchronization D2D.
The transmission UE of connection uses 11 bit N at one endTAValue is to determine the timing relative to down-link reception timing
In advance.In illustrated example, the timing advance received at the transmission UE of connection is arranged to the twice of propagation delay.Even
Then the UE for connecing can use 11 bit N of identicalTAValue to control the transmission timing of D2D data, and by by the NTAValue is simultaneously
Enter in 11 bit fields of control message (also referred to as dispatching distribution (SA) message), by the NTAValue is sent as timing advance value
To reception UE.
Continuous line frame graph has shown the timing by the transmission UE from connection to the data is activation of the direct link for receiving UE.Cause
It is also used for controlling the transmission timing of D2D data, institute using the timing advance value that calculating is sent for uplink data to send UE
Can receive smoothly to receive inside FFT windows at which with base station or eNodeB and include D2D data and in LTE/WAN up-links
The signal all on the horizon of the data of transmission.
In sum, if sending UE in the RRC connection status, above-mentioned solution allow to reduce by
Inter-carrier interference in receptions of the eNodeB on up-link LTE channel to data, this is because, for direct point-to-point data link
And identical timing advance is used for (legacy) LTE uplink communications are left, send D2D data.
In alternative configuration, it is exclusively used in N in SA messageTAThe field of value can be only 6 bits.In the case, connect
UE can be by NTAValue is sent to before receiving UE2 in SA message, the 11 bit N that will be sent for up-linkTAUnder value
It is sampled as 6 bits.Used as the example of down-sampling, UE1 can only send up-link N to UE2TA6 highest significant bits of value.
The thought of alternative configuration can be by the example below explanation.If sent out for the LTE uplink datas to base station
The 11 bit N for sendingTAValue is NTA_UPLINK=11011011001, then the direct link of the down-sampling for being calculated by considering 6MSB is fixed
When information will be 110110.In the down-sampling to information carried out by the transmission UE for connecting, the first bit will be lost, and
The direct link generated at the transmission UE of connection sends timing value will be by NTA_D2D=11011000000 are given.Similarly, receive
The value will be passed on the direct link timing information that (convey) is 110110 by SA message sinks by UE.Based on this, UE is received
Direct link can be generated and receives timing value by being added to (prepend) before received value by a series of zero.Direct chain
It will be N that road receives timing valueTA_D2D=11011000000.
More than it is only used for illustrating how the general concept of the present invention can apply example in certain embodiments.
However, it is necessary to clear, this example is not restricted.For example, up-link send timing value can be more shorter than 11 bits or more
It is long.Similarly, direct link timing information can be generated by the process different from down-sampling.Although to having 6 bits
Direct link timing information is referred to, and direct link timing information can be with longer.Can equally be well applied to direct link transmission
Timing value.
The right-hand side of Figure 14 is related to be entered by the transmission UE (being also referred to as from now on idle UE) in RRC idle conditions
Capable D2D data is activations.In the case, idle transmission UE is not received any can calculating based on which from eNodeB and is effectively determined
When advance value NTATiming advance order.Therefore, idle UE also not have can be used as effective NTAValue and send to receive UE simultaneously
And can send timing in any reference for receiving the basis for being used as window to be received for synchronization FFT at UE.Therefore, idle UE is used
Down-link reception timing is as a reference point, and by generating such as N based on down-link reception timingTAThe direct chain of value
Road sends timing value to control for the timing to the direct link data is activation for receiving UE.Therefore, idle transmission UE will determine
When advance value NTAIt is set to zero.In addition, idle UE generation can be with NTAValue it is consistent or can be it is for example as above under adopt
The N of sampleTAThe direct link timing information of value, direct link timing information is incorporated in SA message, and by SA message send to
Receive UE.Receive UE and then by using being arranged to zero timing advance value for being sent to control by direct link channel
Transmission timing, and FFT arranged based on the timing advance value that received receive window.Meanwhile, idle transmission UE can be using first
Before be set to 0 NTAValue to control D2D data transmission timing.Because the transmission timing of D2D data can different from idle UE
The transmission timing that can determine when timing advance order is received from eNB, so D2D data are not being arranged by eNB
Receive in window and send.
Above with reference to described in the UE of connection, NTAIt can be that direct link timing is believed that value can be included in SA message
In 11 bits or 6 bit fields of breath.
Above-mentioned solution may be problematic at present, this is because, based on current techniques, also in identical (up-link) frequency
The eNodeB received in rate can not smoothly receive institute inside the reception FFT windows that may cause ICI (inter-carrier interference)
There is signal on the horizon (D2D and LTE/WAN up-links).This will produce interference, decoding performance is declined and is subtracted SNR
It is little.It is contemplated, however, that, following progress may allow to by reception UE by direct link using timing carry
Before be arranged in the case of 0, also obtain good result.
In sum, the solution for illustrating with reference to the right-hand side of Figure 14 allows the transmission UE of free time to control to pass through
The transmission timing of direct link.However, the data for being sent by idle pulley UE at present will not be in FFT receives quilt inside window
ENodeB is smoothly received, and is thus produced WAN and ICI in the reception by eNodeB on up-link LTE channel to data and is done
Disturb.Therefore such mode will need ICI mitigation techniques, protection band etc..
Figure 15 schematically shows D2D communication systems, including base station 510, multiple user equipment (UE)s 1 with D2D functions
To UE3 (representing below by way of co expression " adjacent UE " or " adjacent end "), the transmission user equipment 500 with D2D functions
With the reception UE 501 with D2D functions.
For the sake of explanation, it will be assumed that send UE and be currently in idle pulley.Obviously, this condition is only interim
, and it must be understood that send UE 500 can be being switched to RRC connection modes from RRC idle pulleys.In this example, phase
Adjacent user equipment (UE) 1 disappears to UE3 in order to D2D discoveries and/or the purpose for communicating exchange dispatching distribution with transmission user equipment 500
Breath.However, it should be noted that the scheduling assignment messages may even be not intended for the UE 500 for being sent, but for right
The data communication answered some other UE interested.Assumed in neighbor user devices and/or receiving terminal in this example extremely
Some are in RRC connection status less.Therefore, as before with reference to Figure 14 left-hand side and described in, the adjacent UE of connection will be from
ENB receives the N of the timing (LTE uplink timings) sent for the uplink data generated for control to base stationTAValue
Timing advance order.The timing advance sent based on the up-link for being received by eNodeB is ordered by the adjacent UE of connection
Order, generates direct link timing information, the direct link timing information for being generated is included in scheduling assignment messages, and is sent
It is intended to the SA message received by the user equipment with D2D functions interested near them.Direct link timing information
Can be used to control 11 used bit N of uplink data transmission by the UE for connectingTAValue.Alternatively, direct link is fixed
When information can be by for LTE uplink timings 11 bit NTA6 bit values that value carries out down-sampling and obtains.So
And, it is therefore clear that the other embodiment for direct link timing information is also possible, without departing from this solution
Thought.
Idle pulley sends UE 500 and receives at least one direct link control information message or scheduling in receiving unit 540
Assignment messages.Direct link timing information in the scheduling assignment messages for being received then will be in control unit or in signal generating unit
570 are used to generate idle timing advance value NTA.The idle timing advance value for being used for D2D communications by idle transmission UE is below
Also by by the expression of " derived timing advance " or " derived direct link transmission timing value " representing.Derived direct chain
Road send timing value be do not generate at idle UE when timing advance order is received from eNB, but based on being given birth to by other UE
Into and broadcast or send timing advance value determine or derived timing advance value.
According to embodiment, idle transmission UE 500 can directly use from one of neighbor user devices the timing for receiving to carry
Front value.It is important here that noting, idle transmission UE 500 may know that or not know the institute is received from by timing advance value
State whether user equipment is RRC connections.The situation in 6 bit fields of SA message is stored in the timing advance value for being received
Under, 6 bit timing advance value are extracted in sending the scheduling assignment messages that user equipment 500 can be received from the UE from connection.With
Afterwards, send UE 500 11 bit timing advance value are generated based on the 6 bit timing advance value for being received.11 for being generated are than specific
When advance value will be sent to by transmitting element 560 reception UE 501.
According to advantageous embodiment, idle transmission UE 500 can select timing advance value based on selection standard.For example,
Idle UE can be selected from transmit power higher than determining that the adjacent UE for predefining threshold value (as higher than certain predefined dBm) is received
When advance value as candidate's timing advance value.Alternatively or additionally, idle UE only can be used from connection status
The timing advance value that adjacent UE is received.For this purpose, the scheduling assignment messages can include the adjacent UE for sending the dispatching distribution
The instruction explicitly or implicitly whether being in RRC connection modes；When the adjacent UE itself for sending the dispatching distribution has led
When going out timing advance value, latter case may occur, in this case, such derived timing advance value with connect from RRC
The timing advance value for meeting the UE of state is compared with lower priority.According to another replacement, idle UE only can be used from when little
The timing advance value received closer to the adjacent UE for sending UE when there is another adjacent UE in area.
In a word, based on the timing advance value that the user equipment at UE 500 near idle UE is received is being sent, generate and use
In it is determined that by direct link from idle UE 500 to timing, the derived timing advance value of the data is activation for receiving UE 501
Or derived direct link sends timing value.Advantageously, idle UE can select from the adjacent UE of the connection near which what is received
Timing advance value.The user equipment of connection must be near idle transmission UE, so as to perform and the D2D for sending UE 500
Message transmission.Therefore, the timing advance value for receiving from the UE of connection will be extraordinary approximate, so as at idle transmission UE
Generate the timing for determining the data is activation by direct link and send in window D2D numbers for receiving in the FFT of eNB
According to direct link send timing value.
According to transmission terminal described here and the advantageous embodiment of the replacement of method, derived from signal generating unit generation
Direct link timing information can be at least one of of the direct link timing information from the reception of at least one adjacent end
Commonly (plain) or weighted average.
Idle transmission UE can receive corresponding timing from several neighbor user devices UE1 to UE3 in receiving unit 540
Advance value TA1 to TA3.Then the timing advance value for being received from SA message extractions as previously mentioned, and it is single to be input to control
Unit 590 or signal generating unit 570.Then signal generating unit 570 can be averaged to generate derivation to the TA value TA1 to TA3 for being received
Timing advance value.Then the derived timing advance value for so generating will be sent to receive user equipment 501.
Alternatively, idle transmission UE can calculate from adjacent UE the timing advance value or direct link timing information for receiving
Weighted average.For example, with the timing from the adjacent UE receptions in RRC idle conditions and/or away from idle transmission UE
Advance value is compared, and the timing that the adjacent UE from closer idle transmission UE 500 or in RRC connection status is received is carried
Front value can be endowed more weights.Similarly, the timing advance value for receiving from the adjacent UE with high transmit power can also
It is endowed more weights.
According to the further development of dispensing device described here and method, if sending no adjacent end near terminal
End, then derived timing advance value can be set to 0 by signal generating unit 570.Further developed according to another, if sending terminal
Outside coverage, then derived direct link timing information can also be set to 0 by signal generating unit 570.
According to the further development of dispensing device described here and method, transmission terminal of the invention can include
Control unit 590, which is based on predefined selection standard, among the direct link timing information for being received selects multiple candidates straight
Chain link road timing information.Selected candidate's direct link information can be subsequently used for generating direct link timing letter derived from institute
Breath.
In the dispensing device according to the dispensing device and method of the described present invention, can be based on corresponding adjacent end
Transmit power or based on send terminal relative to base station positional information, select candidate's direct link timing information.
Additionally or alternatively, the development according to dispensing device and method described here, control unit 590 can be selected
It is higher than the direct link timing information of the adjacent end reception of predetermined threshold and/or closer transmission terminal from transmit power, makees
For candidate's direct link timing information.
The invention further relates to the transmission of the direct link data is activation carried out by transmission terminal in being used to control communication system
The communication means of timing.Methods described is included in receiving unit and receives for determining in adjacent end from least one adjacent end
The step of by the direct link timing information of the timing of the data is activation of direct link.In signal generating unit based on the use for being received
In the direct link timing information that the direct link carried out by least one adjacent end sends, derived directly chain is generated
Road timing information.Derived direct link timing information can be used for generating for determining the data is activation by direct link
Timing derived direct link timing value.Methods described also includes sending direct link timing derived from institute to receiving terminal
Information, a direct link timing information derived from institute can at the receiving terminal for generate for determination will on direct link from
The direct link for sending the reception timing of the data that terminal is received receives timing value.Derived from utilizing and generated in transmitting element
Direct link sends timing value, sends data to receiving terminal by direct link.
Reference will also be made to the additional and replacement operating procedure that Figure 16 describes method according to an embodiment of the invention.
Figure 16 is the flow chart of the transmission timing configured of the idle transmission UE 500 of description.
In step S00, judge to send UE whether in RRC idle conditions.If answer is negative, then send UE
In RRC connection status, therefore the timing advance for including that timing value is sent for adjusting up-link can be received from base station
The control information message of order.Sending UE and then sending timing value using up-link is used to generate for determining by direct
The direct link of the timing of the data is activation of link sends timing value, and process skips to step S06.This process is by reference to figure
The situation described in 14 left-hand side and illustrate.
If judging that in step S00 D2D sends UE in RRC idle conditions, then in step S01, send UE
Check whether other user equipmenies (adjacent UE) can obtain in its vicinity.Alternatively, idle transmission UE 500 can be determined that
The UE of no other connections is in its vicinity.This is optional step and can alternatively in the scheduling assignment messages from neighbouring device
Perform in the case of comprising any implicitly or explicitly information with regard to sending the RRC state of the UE of scheduling assignment messages.If
There is no adjacent UE near idle transmission UE, then direct link transmission timing value is set to 0 by idle transmission UE, and
Method skips to step S06, and which will be described later.In step S02, whether inspection idle UE is outside network coverage.Such as
Fruit idle UE is outside network coverage, then direct link transmission timing value is set to 0 (step S09) by idle UE, and
And method skips to step S06, which will be described later.
If other adjacent UE are near idle transmission UE, then idle transmission UE is in step S03 from one or many
Individual adjacent UE near which receives SA message or control information message.Control information message includes being passed through for control by adjacent UE
The timing advance value that the transmission of direct link is regularly used.In step S04, it is determined whether receive from phase in step S03
The more than one timing advance value of adjacent UE.If only receiving a timing advance value in receiving unit 540, then uniquely connect
The timing advance value or direct link timing information of receipts is used to determine by from transmission UE 500 to reception UE 501 for generating
The derived direct link of timing of data is activation of direct link send timing value (S10), and method skips to step
S06.In the case, the timing advance value N for receiving from adjacent UETACan it is no it is any for control by direct link
Reception UE is used and is sent in the case of the modification for sending timing.
If more than one adjacent UE is near idle transmission UE, then signal generating unit 570 can be based in step S05
The multiple direct link timing informations at least receiving from adjacent UE in receiving unit, generate derived from direct link timing information with
And derived direct link sends timing value.In step S06, send UE and the derived direct link timing information for being generated is sent out
Deliver to reception UE.6 ratios that the derived direct link timing information for being generated for example can include in D2D scheduling assignment messages
Send in special or 11 bit fields.
In the foregoing description, adjacent UE is referred to.These adjacent UE can be the UE of connection or be in RRC free time shapes
UE in state.In the first scenario, direct link timing information will be based on the timing received from base station by corresponding adjacent UE
The direct link timing information that advance command is generated.On the other hand, if adjacent UE is in RRC idle conditions, in the free time
The direct link timing information that UE 500 is received will according to derived from said method and process are calculated in adjacent UE direct chain
Road timing information.
The present invention advantageous embodiment in, from multiple adjacent UE have received multiple timing advance values in coverage
Idle pulley D2D user equipmenies can by take all receptions timing advance value common average generating direct link
Timing information.
Alternatively, the transmission UE of idle pulley can select one among the direct link timing information received from adjacent UE
Individual or multiple candidate's timing advance values.Selection to candidate's timing advance value can be based on predetermined selection standard.As an example, it is empty
Not busy transmission UE can only select from the UE of the connection for meeting predefined energy behavior those timing advance values for receiving.Therefore,
Idle transmission UE only can be believed from the direct link timing via transmit power higher than the adjacent UE transmissions of predefined threshold value
Breath is selected as candidate's timing advance value.Advantageously, the transmit power for selection standard can be from correspondence transmitting element pre-
Define (such as on D2DSS or any other predetermined channels) measurement on particular channel.
In the replacement development that can also implement in the above-described embodiments, idle transmission UE can be selected based on positional information
Select timing advance value.Positional information can be sent together with direct link timing information by corresponding adjacent UE.The position for being sent
Confidence breath can include the information with regard to adjacent UE relative to the position of base station, or which can be such as absolute GPS position.Position
Confidence breath will allow idle UE to select the timing advance value sent by the adjacent UE of closer their own.Lean on idle UE
The timing advance value of close adjacent UE actually by be idle UE accurate timing advance value it is extraordinary approximate.Additionally
Or alternatively, idle UE can also be additionally based on distance of the idle UE away from base station, select candidate's timing advance value.Position can be calculated
Confidence ceases and distance, for example, based on gps data or is based instead on the calculating location informations such as path loss or signal intensity
And distance.
Alternatively or additionally, in the transmission terminal or idle UE and method according to embodiment, the direct chain for being received
Road timing information can include indicating the received effective effectiveness of the timing advance value of direct link timing information or reception
Information.According to advantageous embodiment, if the direct link timing information for being received is included for from adjacent terminal to base station
The up-link that line link sends sends timing information value, then the direct link timing information for being received is accepted as effectively.
Therefore control unit 590 can select candidate's direct link timing information based on effectiveness information.Effectiveness information can be bag
The field in the direct link timing information received from adjacent UE is included, and can include indicating that adjacent end connects in RRC
Connect the information in state.Idle UE can only select among the direct link timing information for being received based on effectiveness information and
It is judged as effective those direct link timing informations.If the timing advance value received at the idle UE is via being in
Adjacent UE in RRC connection status sends, then the timing advance value is considered effectively.This replacement can by
Scheduling assignment messages include the effectiveness information of the type for indicating timing advance implementing.Specifically, type indicate can be
1 bit flag being included in scheduling assignment messages, which indicates that timing advance value includes being obtained/being maintained by connection mode UE
The effective timing advance value of value 0 still includes the timing advance value of the calculating of value 0 by derived from another idle pulley UE.
As described above, receiving the user equipment in coverage of multiple timing advance values from the adjacent UE of multiple connections
Can be by taking common average according to the above-mentioned timing advance value for being received for indicating selection, generating direct link derived from institute
Timing information.Specifically, idle UE can pass through only to adjacent from what is be transmitted with the transmit power for being higher than predefined threshold value
The timing advance value that UE is received is averaged, and generates direct link timing information derived from institute.Alternatively, idle UE can be by only
Timing advance value to being indicated as valid timing advance value as mentioned above is averaged, and generates direct link timing derived from institute and believes
Breath.
As described above, the transmission UE of free time can alternatively calculate from adjacent UE the timing advance value or direct link for receiving
The weighted average of timing information.For example, with from connecing in the RRC idle conditions and/or away from the adjacent UE of idle transmission UE
The timing advance value of receipts is compared, and the adjacent UE from closer idle transmission UE 500 or in RRC connection status is received
Timing advance value can be endowed more weights.Similarly, the timing advance for receiving from the adjacent UE with high transmit power
Value can also be endowed more weights.
In the case where idle UE is outside network coverage, idle UE may not be received from connection mode UE to be included
The SA message of valid timing advance value.In the case, timing advance value derived from institute can be set to 0 by idle UE.If
Idle UE receives the reception time that UE can store SA message outside network coverage, then, and is used to control using this value
The reception timing of the data sent by direct link from idle transmission UE.
Figure 17 schematically shows and such as uses effective N by the UE being connectedTAThe FFT that value determines receives the positioning of window and compares
, the positioning (right-hand side) of such as FFT reception windows in the case of idle transmissions UE that the method according to the invention determines.I.e.
Make Idle subscriber devices not connected and therefore the timing advance that timing value is sent for adjusting up-link is not received from eNodeB
Order, the available timer command that idle UE also will use the Ue by other in coverage to receive.In like fashion, idle UE energy
Enough generations can be used to control the timing of the data is activation by direct link and can send to the timing advance of receiving terminal
Value (also referred to as derived timing advance value).Then receiving terminal is possible to pass through from terminal is sent with good approximate determination
The reception timing of the data that direct link is received.This will allow eNodeB or base station may cause ICI at which (intercarrier is done
Disturb) reception FFT windows inside smoothly receive all signals on the horizon (D2D and LTE/WAN up-links).
Another aspect of the present invention is directed to use with hardware and software and implements above-mentioned each embodiment and aspect.In this respect,
The invention provides user equipment (mobile terminal) and eNodeB (base station).User equipment performs method described here.Additionally,
ENodeB includes enabling eNodeB to assess each user equipment from the IPMI collection quality informations received from user equipment
IPMI collection quality and the IPMI collection quality of different user devices is considered when by its scheduling unit scheduling different user devices
Unit.
It is also to be recognized that each embodiment of the present invention can be practiced or carried out using computing device (processor).Calculate
Equipment or processor may, for example, be general processor, digital signal processor (DSP), special IC (ASIC), scene
Programmable gate array (FPGA), or other PLDs etc..Can also be performed by the combination of these equipment or real
Each embodiment of the existing present invention.
Furthermore it is also possible to implement the present invention using by computing device or the direct software module for performing within hardware
Each embodiment.Furthermore, it is possible to software module and hardware are implemented to combine.Software module can be stored in any kind of
On computer-readable recording medium, the computer-readable recording medium such as RAM, EPROM, EEPROM, flash memory, depositor,
Hard disk, CD-ROM, DVD etc..
It shall yet further be noted that each feature of different embodiments of the invention can individually or combination in any ground as another
Bright theme.
It will be understood by those skilled in the art that the present invention as shown in the specific embodiments can be carried out various modifications and/
Or modification, without departing from the spirit or scope of the present invention of wide in range description.Therefore, the present embodiment should be considered as in every respect
It is bright property and and nonrestrictive.
Claims (15)
1. terminal (500) is sent, for sending data to receiving terminal by direct link connection in a communications system
(510) it is, described to send the transmission timing that terminal determines the direct link data is activation in communication system, and including：
Receiving unit (540), receives for determining by direct link in the adjacent end from least one adjacent end
The direct link timing information of the timing of data is activation；
Signal generating unit (570), based on the direct link sent for direct link received from least one adjacent end
Timing information, generates derived direct link timing information, and the derived direct link timing information can be used in generating to be used
In it is determined that the derived direct link of timing of data is activation by direct link sends timing value；
Transmitting element (560), sends the derived direct link timing information, the derived direct link to receiving terminal
Timing information can be used in generation at the receiving terminal and will receive from the transmission terminal on direct link for determination
Data reception timing direct link receive timing value.
2. as claimed in claim 1 to send terminal (500), the described derived direct link generated in the signal generating unit is fixed
When information be the direct link timing information received from least one adjacent end at least one of common or weighting
Averagely.
3. it is as claimed in claim 1 or 2 to send terminal (500), if near the transmission terminal no adjacent end or
Outside coverage, then the signal generating unit (570) will the derived direct link timing for transmission terminal (570) described in person
Information is set to 0.
4. the transmission terminal as any one of Claims 1-4, also including control unit (590), based on predefined selection
Standard, selects multiple candidate's direct link timing informations, candidate's direct link among the direct link timing information for being received
Information is used to generate the derived direct link timing information.
5. it is as claimed in claim 5 to send terminal, the power for being received based on corresponding adjacent end or it is based on described
Make arrangements for his funeral positional information of the end away from base station, select candidate's direct link timing information.
6. as claimed in claim 6 to send terminal, it is higher than predetermined threshold that described control unit (590) is selected from transmit power
And/or the direct link timing information that the closer adjacent end for sending terminal is received, as the timing of candidate's direct link
Information.
7. the transmission terminal as any one of claim 5 to 7, the direct link timing information for being received include effectiveness
Information, also, described control unit selects candidate's direct link timing information based on the effectiveness information, and it is described effective
Property information include indicating information of the adjacent end in RRC connection status.
8. the transmission terminal as any one of claim 1 to 7, the direct link timing information for being received include for from
The adjacent end sends timing information value to the up-link that the up-link of base station sends.
9. the communication means of the transmission timing of the direct link data is activation carried out by transmission terminal in being used for controlling communication system,
Methods described includes step：
Receive for the data by direct link are determined in the adjacent end from least one adjacent end in receiving unit
The direct link timing information of the timing of transmission；
Signal generating unit based on the direct link received for being carried out by least one adjacent end send it is direct
Link timing information, generates derived direct link timing information, and the derived direct link timing information can be used in life
Timing value is sent into the derived direct link for determining the timing of the data is activation by direct link；
The derived direct link timing information, the derived direct link timing are sent to receiving terminal in transmitting element
Information on direct link from described can will send number that terminal receive for determining for generating at the receiving terminal
According to reception timing direct link receive timing value；And
The derived direct link for being generated is utilized to send timing value in the transmitting element, by direct link by data is activation
To the receiving terminal.
10. communication means as claimed in claim 9, in direct link timing information derived from the institute that the signal generating unit is generated
It is at least one of common or weighted average of the direct link timing information received from least one adjacent end.
11. communication means as described in claim 9 or 10, also including step：If sending no phase near terminal described
Direct link timing derived from institute is then believed outside coverage by adjacent terminal or the transmission terminal in the signal generating unit
Breath is set to 0.
12. communication means as any one of claim 9 to 11, also including step：In control unit based on predefined
Selection standard, selects multiple candidate's direct link timing informations among the direct link timing information for being received, and candidate is direct
Link information is used to generate the derived direct link timing information.
13. communication means as claimed in claim 12, transmit power based on corresponding adjacent end or based on corresponding adjacent
The positional information of terminal, selects candidate's direct link timing information.
14. communication means as claimed in claim, select step, select from transmit power be higher than predetermined threshold and/or compared with
Near the direct link timing information that the adjacent end for sending terminal is received, as candidate's direct link timing information.
15. communication means as claimed in claim 13, the direct link timing information for being received include effectiveness information, and
And, select candidate's direct link timing information, the effectiveness information to include that instruction is described based on the effectiveness information
Information of the adjacent end in RRC connection status.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14180431.0 | 2014-08-08 | ||
| EP14180431.0A EP2983425B1 (en) | 2014-08-08 | 2014-08-08 | D2D Data Transmission - Timing Advance for Idle Mode UE |
| PCT/EP2015/055192 WO2016020072A1 (en) | 2014-08-08 | 2015-03-12 | D2d data transmission - timing advance for idle mode ue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106605434A true CN106605434A (en) | 2017-04-26 |
| CN106605434B CN106605434B (en) | 2019-12-31 |
Family
ID=51300599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580046866.9A Expired - Fee Related CN106605434B (en) | 2014-08-08 | 2015-03-12 | D2D data transmission-timing advance for idle mode UE |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10225815B2 (en) |
| EP (1) | EP2983425B1 (en) |
| JP (1) | JP6445135B2 (en) |
| CN (1) | CN106605434B (en) |
| WO (1) | WO2016020072A1 (en) |
Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9661653B2 (en) * | 2014-05-08 | 2017-05-23 | Intel IP Corporation | Device to-device (D2D) communications |
| EP3487235B1 (en) * | 2014-05-08 | 2022-07-06 | LG Electronics Inc. | Method for processing plurality of signals in communication system supporting direct communication between terminals and apparatus therefor |
| RU2658663C1 (en) | 2014-08-01 | 2018-06-22 | Сан Пэтент Траст | Control over transmission timing for d2d communication |
| US9877334B2 (en) | 2015-04-05 | 2018-01-23 | Ofinno Technologies, Llc | Cell configuration in a wireless device and wireless network |
| US11641255B2 (en) | 2015-04-05 | 2023-05-02 | Comcast Cable Communications, Llc | Uplink control information transmission in a wireless network |
| WO2016163824A1 (en) * | 2015-04-08 | 2016-10-13 | 엘지전자 주식회사 | Selective prioritization method of frequency executed by terminal in wireless communication system, and terminal using same method |
| CN107439049B (en) | 2015-04-09 | 2020-12-22 | Lg 电子株式会社 | Method of performing logical channel prioritization in carrier aggregation with at least one SCELL operating in unlicensed spectrum and apparatus therefor |
| US10701692B2 (en) | 2015-08-10 | 2020-06-30 | Qualcomm Incorporated | Techniques for managing uplink transmissions in a shared radio frequency spectrum band and a dedicated radio frequency spectrum band |
| WO2017048010A1 (en) * | 2015-09-15 | 2017-03-23 | 엘지전자 주식회사 | Device to device communication method in wireless communication system and apparatus therefor |
| WO2017166138A1 (en) * | 2016-03-30 | 2017-10-05 | 广东欧珀移动通信有限公司 | Relay transmission method and device |
| CN109314953B (en) * | 2016-03-30 | 2021-08-31 | 华为技术有限公司 | D2D communication method and device |
| CN107371263B (en) * | 2016-05-12 | 2022-08-19 | 中兴通讯股份有限公司 | Method and device for scheduling uplink resources |
| WO2017194161A1 (en) * | 2016-05-13 | 2017-11-16 | Telecom Italia S.P.A. | Method and system for loss mitigation during device to device communication mode switching |
| CN108886682B (en) | 2016-06-03 | 2022-04-15 | Oppo广东移动通信有限公司 | Method and device for relay transmission |
| US10314037B2 (en) * | 2016-07-08 | 2019-06-04 | Qualcomm Incorporated | Latency reduction techniques in wireless communications |
| CN107690183A (en) * | 2016-08-05 | 2018-02-13 | 株式会社Ntt都科摩 | Uplink data transmission method and device |
| EP3282618A1 (en) | 2016-08-09 | 2018-02-14 | Panasonic Intellectual Property Corporation of America | Improved initial and retransmissions of data for v2x transmissions |
| US10420128B2 (en) * | 2016-11-11 | 2019-09-17 | Qualcomm Incorporated | Uplink data transfer for wireless communications with mixed transmission time intervals |
| CN108337728B (en) * | 2017-01-19 | 2022-03-18 | 中兴通讯股份有限公司 | Timing advance maintenance method, device and system |
| CN108633019B (en) * | 2017-03-23 | 2022-02-08 | 华为技术有限公司 | Information transceiving method and device |
| WO2018201459A1 (en) * | 2017-05-05 | 2018-11-08 | Oppo广东移动通信有限公司 | Method for allocating logical channel resources and terminal device |
| KR102164034B1 (en) * | 2017-05-08 | 2020-10-12 | 엘지전자 주식회사 | Method for performing V2X communication in wireless communication system and apparatus therefor |
| CN109644470B (en) * | 2017-06-16 | 2020-10-27 | Oppo广东移动通信有限公司 | Communication method, terminal equipment and network equipment |
| US10182357B1 (en) * | 2017-09-20 | 2019-01-15 | Echelon Corporation | System and method for bottom-up invocation of control signal repeaters in a mesh lighting network |
| US10419953B2 (en) * | 2017-12-05 | 2019-09-17 | Echelon Corporation | Self-healing lighting network |
| KR102503003B1 (en) * | 2018-04-05 | 2023-02-24 | 삼성전자 주식회사 | Method and apparatus for performing cell selection and reselection in inactive mode in next generation wireless communication system |
| CN116761279A (en) | 2018-04-05 | 2023-09-15 | 三星电子株式会社 | Method and apparatus for operating protocol layer of terminal in mobile communication system |
| CN112534893B (en) * | 2018-08-10 | 2022-09-16 | 华为技术有限公司 | Communication method and device |
| CN111385765B (en) * | 2018-12-28 | 2022-07-22 | 大唐移动通信设备有限公司 | Information transmission method and terminal |
| CN113508624B (en) * | 2019-03-28 | 2022-05-24 | 华为技术有限公司 | Timing alignment method and device |
| WO2022147712A1 (en) * | 2021-01-07 | 2022-07-14 | Qualcomm Incorporated | Timing advance acquisition techniques for sidelink |
| US11632776B2 (en) * | 2021-09-03 | 2023-04-18 | Qualcomm Incorporated | Techniques for handling overlapping transmissions after timing adjustment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165840A (en) * | 2008-09-25 | 2011-08-24 | 诺基亚公司 | Synchronization for device-to-device communication |
| WO2013149886A1 (en) * | 2012-04-02 | 2013-10-10 | Rohde & Schwarz Gmbh & Co. Kg | Method for integrating network participants into an ad hoc network, and corresponding ad hoc network |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103190164B (en) * | 2010-11-04 | 2016-05-04 | 交互数字专利控股公司 | For setting up the method and apparatus of end to end communication |
| JP5357209B2 (en) * | 2011-05-19 | 2013-12-04 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile communication method |
| US20150032720A1 (en) * | 2013-07-23 | 2015-01-29 | Yahoo! Inc. | Optimizing database queries |
| CN107071889B (en) * | 2014-03-21 | 2020-10-09 | 华为终端有限公司 | Method for detecting device-to-device signal and user equipment |
| US10813068B2 (en) * | 2014-05-08 | 2020-10-20 | Apple Inc. | Systems, methods, and devices for synchronization source selection for device-to-device communication |
| US10368367B2 (en) * | 2014-07-21 | 2019-07-30 | Lg Electronics Inc. | Method and apparatus for transmitting uplink signal in wireless LAN system |
| RU2658663C1 (en) * | 2014-08-01 | 2018-06-22 | Сан Пэтент Траст | Control over transmission timing for d2d communication |
-
2014
- 2014-08-08 EP EP14180431.0A patent/EP2983425B1/en not_active Not-in-force
-
2015
- 2015-03-12 CN CN201580046866.9A patent/CN106605434B/en not_active Expired - Fee Related
- 2015-03-12 WO PCT/EP2015/055192 patent/WO2016020072A1/en active Application Filing
- 2015-03-12 US US15/500,868 patent/US10225815B2/en active Active
- 2015-03-12 JP JP2017505071A patent/JP6445135B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165840A (en) * | 2008-09-25 | 2011-08-24 | 诺基亚公司 | Synchronization for device-to-device communication |
| WO2013149886A1 (en) * | 2012-04-02 | 2013-10-10 | Rohde & Schwarz Gmbh & Co. Kg | Method for integrating network participants into an ad hoc network, and corresponding ad hoc network |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2983425A1 (en) | 2016-02-10 |
| US10225815B2 (en) | 2019-03-05 |
| WO2016020072A1 (en) | 2016-02-11 |
| JP2017523718A (en) | 2017-08-17 |
| CN106605434B (en) | 2019-12-31 |
| US20170230928A1 (en) | 2017-08-10 |
| EP2983425B1 (en) | 2019-03-06 |
| JP6445135B2 (en) | 2018-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106605434A (en) | D2D data transmission-timing advance for idle mode UE | |
| US11310755B2 (en) | Transmission timing control for D2D communication | |
| JP6967070B2 (en) | User equipment and method | |
| JP6628165B2 (en) | Sender user equipment and method | |
| CN102415187B (en) | Logical channel prioritization procedure for generating multiple uplink transport blocks | |
| CN106464715A (en) | Resource assignment for D2D discovery transmissions | |
| CN106716910A (en) | Method for transmitting D2D signal and terminal therefor | |
| CN107211470A (en) | Improved resource allocation for device-to-device (D2D) communication | |
| CN103430473B (en) | Distribution is used for the method controlling channel element and the network node of physical downlink control channel | |
| CN104010368B (en) | TDD configures update method, apparatus and system | |
| CN107615844A (en) | More adjacent service groups communication during sidelink control time | |
| CN106165329A (en) | In self adaptation TDD system, UL controls the physical source distributing of channel | |
| KR20240011687A (en) | Support for increased quantity of sidelink configuration grants | |
| US20230254887A1 (en) | Phy-layer handling of multiple relayed transport blocks by an af/df-relay ue in sidelink | |
| JP2020025362A (en) | Multiple side link control transmissions during side link control period | |
| JP6820568B2 (en) | Communication equipment, communication methods and integrated circuits | |
| JP2020017980A (en) | MULTIPLE ProSe GROUP COMMUNICATION DURING SIDE LINK CONTROL PERIOD | |
| CN108574990A (en) | The method and its device of downlink channel are sent and received by short TTI frame structures | |
| RU2751539C2 (en) | Transmission timing control for d2d communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191231 |